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[thompson]

Animals

Spoiler (click to show/hide)

Spell effects:

• Summons a companion animal, or hostile animal
• Grants an animal sentience
• General healing and attribute buffs for animals
• Transform into an animal

Environmental effects:

• At LOW levels:
  
  • Unusually high animal populations
  • Unusually high diversity of animal species
  • New herds frequently migrate and leave
• At MEDIUM levels:
  
  • Extraordinary abundance of animal life
  • Grass grows very rapidly, and can support large herds
  • Animals have larger litters when breeding
• At HIGH levels:
  
  • Animals display an unusually high degree of intelligence, including the [CAN_LEARN] tag in some rare cases
  • Intelligent animals may petition to join the fortress
  • Animal people are common in these areas
  • Animals of different species may interbreed
• At EXTREME levels:
  
  • Animals may appear civilised
  • Conversely, sentient creatures may lose the [CAN_LEARN] tag randomly and become animal-like over time
  • Animal-like dwarves can be trained, sheared, milked or butchered
  • Animals may spontaneously spring into existence, including new species
  • Animals may spontaneously change species, or sentient creatures transform into animals

Creature effects:

• At LOW levels:
  
  • Creatures may be unusually large or small, or have atypical features for their species (furry lizards, for instance)
• At MEDIUM levels:
  
  • Creatures appear as hybrids of other animal species, such as elephant-tigers
• At HIGH levels:
  
  • Hybrid creatures become extraordinarily common, with great diversity
• At EXTREME levels:
  
  • Multi-animal hybrids exist, such as whale-fox-horse-tigers

Plant effects:

• At MEDIUM levels:
  
  • Vegetation may appear furry, scaly or have feathers instead of leaves
• At HIGH levels:
  
  • Trees may make barking noises, or other animal-like vocalisations
  • Trees howl in agony and bleed when cut
  • Some trees may drop wool, silk or milk

Object effects:

• At MEDIUM levels:
  
  • Objects may appear furry or scaly
  • Objects may vocalise, or make purring noises when stroked
• At HIGH levels:
  
  • Objects occasionally become animate, and move freely at will

The way I envision an EXTREME biome to work is that you'd start out with your normal 7 dwarves, 2 cats and 4 dogs, but over time your dwarves would grow dumber and dumber. Before you know it your baron is a cat, half your dwarves are pastured so your dogs can make DWARF BEARD SOCKS and the other half are trained as WAR DWARVES and tied up near the entrance as an early warning.

Art

Spoiler (click to show/hide)

Spell effects:

• Animates a work of art
• Increases the quality of an artwork
• Recovers artwork that has been lost to vandalism
• Inspires the creation of an artefact

Environmental effects:

• At LOW levels:
  
  • Art of somewhat higher quality than usual is produced
  • The landscape may appear painted or sculpted
• At MEDIUM levels:
  
  • Art of significantly higher quality than usual is produced
  • New artefacts tend to be purely aesthetic objects
  • Statues and engraved images may appear to watch people, or move on occasion
  • Dwarves may notice a smell eminating from engravings of food objects
  • Art desecration has much larger emotional impact than usual
• At HIGH levels:
  
  • Artefacts produced with much higher frequency than usual
  • Statue may come to life and move. Whether statues are friendly or hostile depends on their content and quality.
  • Engravings may be described as moving scenes
  • Statues may attack dwarves guilty of art desecration, or rampage if no particular dwarf is responsible
  • Ghosts of desecrated artwork may attack if no proper memorial is made
• At EXTREME levels:
  
  • Statues roam freely at all times
  • Images from engravings may physically manifest. The wall left behind becomes bare.

[Hapchazzard]

-snip-

Added. Thanks for the formatting, BTW. Makes it much more easier for me to directly add text to the list.

EDIT: More from myself:

Chaos

Spoiler (click to show/hide)

Spell effects:

• Cast a wild, unpredictable magic
• Throw raw, destructive bolts of pure chaotic energy as weapons
• Summon a magical chaotic creature, if such creatures exist in the universe. It isn't exactly guaranteed to always do your bidding, but may be useful if you want to unleash as much mayhem as possible on an area
• Warp the laws of physics and logic, by e.g. temporarily 'turning off' gravity in an area
• Counter ORDER-based magic
• Influence creatures towards more chaotic personalities

Environmental effects:

• At MEDIUM levels:
  
  • Animals in the area visibly behave erratically
  • If any other magic is present in the area, it is more unpredictable than usual, may ebb and flow more strongly than normal
  • Small objects may shift position for no reason
• At HIGH levels:
  
  • Animals in the area behave illogically and apparently randomly
  • If any other magic is present in the area, it is far more unpredictable than usual, ebbs and flows violently. May go from nearly absent and unusable to amplified and brutal in a matter of minutes
  • Occasionally, magic normally not present in the area may briefly spawn, possibly causing interesting effects when interacting with other arcana
  • Objects and creatures may randomly change their position
  • The laws of physics sometimes break - gravity disappears in areas, water flows in completely wrong directions, objects may transform shape, etc.
  • Rarely, objects may have a paradoxical description - e.g. brightly shining objects that are pitch black
• At EXTREME levels:
  
  • Complete bedlam
  • Magic is hopelessly unpredictable. The entire region is a mad vortex of appearing, disappearing, waxing and waning magics from across the cosmos. Any spells cast in the area will have wildly unpredictable results, if they work at all
  • Everything is constantly changing position, size and shape
  • The laws of physics and logic are contorted beyond recognition, changing wildly with space and time
  • Objects and creatures frequently have paradoxical and oxymoronic descriptions

Creature effects:

• At ALL levels:
  
  • Creature's respect of LAW decreases, affinity for DISCORD increases
• At LOW levels:
  
  • Creature's values are more susceptible to change than normal
• At MEDIUM levels:
  
  • Creature's values are far more susceptible to change than normal, may frequently change for no reason
  • May sometimes do random actions for no readily apparent reason
• At HIGH levels:
  
  • Creature's values and facets are constantly shifting and oscillating chaotically, never staying in a single place for a significant time
  • Frequently does random actions for no readily apparent reason
  • Bodily features may randomly change into something else, rarely
• At EXTREME levels:
  
  • Creature's values and facets are always wildly oscillating, may become completely different in a manner of seconds
  • Is defined by constant, random actions that make no sense
  • Bodily features frequently change into something else, is basically a shapeshifter
  • May have paradoxical and oxymoronic features

[voliol]

In the Boundaries/objects section:

...In places where the border between two planes is weak, may be able to breach it accidentally if sharp

Nice, like the subtle knife from His Dark Materials.

Here's another from me.

Plants

Spoiler (click to show/hide)

Spell effects:

-Ability to manipulate plant growth
-Ability to assume the form of a plant, or in some cases a quasi-plant creature (think treant/dryad/spriggan-type humanoids), and/or ability to grant such forms to NPCs
-Rituals to summon or otherwise commune with nature spirits of a plant-based affiliation

Environmental effects:

-At LOW levels: May see small plants growing in unusual places, such as sprouting out of the floors of buildings.
-At MEDIUM levels: Plants begin to overgrow objects and buildings in the area
-Occasional appearances of plants that aren't normally native to the biome they're growing in
-At HIGH levels: Any civilized structures will be completely overgrown with plant life
-At EXTREME levels: Vegetation cover in a region is so dense as to make travel through it virtually impossible
-Trees may grow noticeably thicker and taller than otherwise natural in regions affected by plant magic.
-Roots of trees may extend unnaturally deep, down to the caverns or even the magma seas
-The biggest trees may extend several hundred z-levels up and have miniature "islands" on them

Creature effects:

-At LOW levels: Creatures may show a bizarre affinity for plant life, such as having one-sided conversations with trees
-At MEDIUM levels: Some creatures will have minor plant-like features in their anatomy, such as twigs emerging from their elbows or a stubble of leaves on their chin
-At HIGH levels: Bark replacing tissue in many creatures, stems and leaves replacing body hair. Creatures may require unusually high levels of exposure to sunlight and water in order to survive.
-At EXTREME levels: Creatures will violently and ruthlessly defend any and all plant life in the area, to the point of physically attacking woodcutters and such. If you like, an exaggerated and more generalized version of what we already get with elves.

Object effects:

-Organic plant weapons. Some may have features like retractable thorns or extending vine tendrils that can lash at opponents.

First off, the "Environment effects" is missing in the PLANT section of the list.
Second, my suggestions:

Spoiler (click to show/hide)

Spell effects:

• Summon a fruit or nut, edible or not.
• Summon a flower.
• Command a tree or other multi-tile plant to uproot itself and move some distance.

Creature effects:

• At HIGH levels: Creature may occasionally bear fruit, that may drop off, be chopped off, and eaten.

Object effects:

• At LOW levels: When created in a mood, plant-based materials are preferred (e.g. wood, remains from a grimeling, or a multi-tile plant).
• At MEDIUM levels: When created in a mood, some plant-based materials are needed.
• At HIGH levels: When created in a mood, most of the artifact will require plant-based materials.
• At EXTREME levels: When created in a mood, the creator may use plant-items that are normally not used in crafting, such as crops and seeds. They may also collect a plant from the wild to use in the artifact.

[thompson]

At extreme levels, why not grow an artefact instead?

[KittyTac]

Reserved for LIES.

[Azerty]

There's interesting stuff to be found in the thread Sphere-based Biomes.

LONGEVITY

Spoiler (click to show/hide)

Spell effects:

• Make a creature live longer than normal

Environmental effects:

• At LOW levels:
  
  • Creatures born there live longer
• At MEDIUM levels:
  
  • Creatures living there live even longer than in LOW (for exemple, two times longer)
• At HIGH levels:
  
  • Creatures passing through live even longer than in MEDIUM (for exemple, five times longer)
• At EXTREME levels:
  
  • Creatures became immortal
  • A body of water could make the drinker live longer (for exemple, ten times longer)

Creature effects:

• At LOW levels:
  
  • Life expectancy doubled
• At MEDIUM levels:
  
  • Life expectancy trebled
• At HIGH levels:
  
  • Life expectancy multiplied by five
• At EXTREME levels:
  
  • Life expectancy multiplied by ten

Plant effects:

• See for creatures, but fruits give the eater a longer life expectancy

Object effects:

• At MEDIUM levels:
  
  • Objects break even less than normal, and became unbreakable at EXTREME

Torture

Spoiler (click to show/hide)

Spell effects:

• Inflict extreme suffering on a creature

Environmental effects:

• At LOW levels:
  
  • Low suffering on those creatures residing there
• At MEDIUM levels:
  
  • Moderate suffering on those creatures residing there
• At HIGH levels:
  
  • High suffering on those creatures residing there
• At EXTREME levels:
  
  • Extreme suffering on those creatures residing there
  • Makes creature more CRUEL

Creature effects:

• At LOW levels:
  
  • Short time of suffering on those creatures
• At MEDIUM levels:
  
  • Moderate time of suffering on those creatures
• At HIGH levels:
  
  • High time of suffering on those creatures
• At EXTREME levels:
  
  • Permant suffering on those creatures
  • Makes creature more CRUEL

Object effects:

• At LOW levels:
  
  • Items tend to inflict suffering on creatures
  • Items tend make creatures wearing them more CRUEL

[/list][/list]

[PlumpHelmetMan]

Currently writing up a REBIRTH list, will post it in place of the current text when it's done.

[Hapchazzard]

Added everything suggested so far.

Nightmares

Spoiler (click to show/hide)

Spell effects:

• Induce fear in a creature
• Cast disturbing hallucinations
• Have the possibility to negotiate and cooperate with some night creatures
• Summon and control bogeymen-like creatures, if they exist in the world
• Reveal a creature's hidden fears and past traumas

Environmental effects:

• At LOW levels:
  
  • Creatures feel uneasy when passing through the area (may get stopped by the 'You feel uneasy' message when passing though, even if there is nothing actually there)
  • Wildlife avoids the area, the area is unusually silent compared to surrounding regions
• At MEDIUM levels:
  
  • Creatures feel like they are being watched when passing through the area
  • Wildlife avoids the area, the area is unusually silent compared to surrounding regions
  • May hear noises just beyond your line of sight that don't have an actual source (e.g. hearing footsteps behind you and turning around to see nothing)
  • If it is nighttime and bogeymen exist in the world, they are more common and stronger
• At HIGH levels:
  
  • Creatures feel like they are being watched when passing through the area
  • Wildlife avoids the area, the area is unusually silent compared to surrounding regions
  • Auditory hallucinations are more common and more disturbing (e.g. cries for help, demonic whispers, distant screams)
  • Visual hallucinations of creepy, high-nightmare creatures may occasionally appear in the corners of your line of sight
  • If it is nighttime and bogeymen exist in the world, they are far more common and stronger
  • Some objects in the area may gain the 'dreamlike' descriptor
  • Night creatures and other high-nightmare creatures might congregate in the area
• At EXTREME levels:
  
  • Creatures feel terror when entering the area
  • Wildlife avoids the area and will offer resistance if forced to enter
  • Auditory hallucinations are common and highly disturbing
  • Visual hallucinations of creepy, high-nightmare creatures appear at the same frequency as before, but this time around some 20% may manifest as actual, physical creatures that can pose a threat to your health
  • If it is nighttime and bogeymen exist in the world, they may spawn at all times and special 'elite' variants may spawn too
  • Many objects in the area may gain the 'dreamlike' descriptor
  • Night creatures and other high-nightmare creatures congregate in the area
  • When it is daytime, tree cover, if it exists, causes an unnatural darkness beneath
  • Area is poorly lit even during daytime (for example, due to unnatural fogginess or cloudiness). Light sources are far less effective than usual

Creature effects:

• At LOW levels:
  
  • Others feel uneasy when talking to or in close proximity to the creature
• At MEDIUM levels:
  
  • Others feel uneasy when around the creature
  • May gain slight happy thoughts from the fear of others
  • May have one or two slightly unnerving physical features (e.g. slightly bleached skin)
• At HIGH levels:
  
  • Others feel fear when around the creature
  • Gains happy thoughts from the fear of others, intentionally goes out of it's way to make others afraid
  • If humanoid, sits in the uncanny valley (e.g. has a creepy grimace, lacks a facial feature, has weird bodily proportions, etc.)
  • If not humanoid, is significantly mutated in disturbing ways
• At EXTREME levels:
  
  • Others feel terror when around the creature
  • Subsists on the fear of others
  • Will actively seek out victims (who are preferably alone) to terrify
  • May initially stalk targets from afar to induce maximum dread
  • If humanoid, sits deep in the uncanny valley (e.g. lacks facial features entirely, has deep black pits instead of eyes, has very disturbing and unnatural grimaces, has a completely still face, has extremely skewed body proportions, has completely white or black skin, etc. For examples, think Slenderman or Bughuul from Sinister)
  • If not humanoid, is heavily mutated in disturbing ways (e.g. has extremely skewed bodily proportions, has unnaturally long claws and teeth, has a creepy face, has fur that behaves in unnatural ways, is bipedal if the 'normal' version of the creature is a quadruped, etc. Think wendigos or mothman)
  • May be completely silent (even when doing activities that would normally produce noise) or emit unnerving noises
  • Possibly has an increased movement speed when out of sight
  • Possibly may be able to hide in mirrors, engravings, paintings, books, etc.

[UristMcVampire]

-snip-

Added. Thanks for the formatting, BTW. Makes it much more easier for me to directly add text to the list.

EDIT: More from myself:

Chaos

Spoiler (click to show/hide)

Spell effects:

• Cast a wild, unpredictable magic
• Throw raw, destructive bolts of pure chaotic energy as weapons
• Summon a magical chaotic creature, if such creatures exist in the universe. It isn't exactly guaranteed to always do your bidding, but may be useful if you want to unleash as much mayhem as possible on an area
• Warp the laws of physics and logic, by e.g. temporarily 'turning off' gravity in an area
• Counter ORDER-based magic
• Influence creatures towards more chaotic personalities

Environmental effects:

• At MEDIUM levels:
  
  • Animals in the area visibly behave erratically
  • If any other magic is present in the area, it is more unpredictable than usual, may ebb and flow more strongly than normal
  • Small objects may shift position for no reason
• At HIGH levels:
  
  • Animals in the area behave illogically and apparently randomly
  • If any other magic is present in the area, it is far more unpredictable than usual, ebbs and flows violently. May go from nearly absent and unusable to amplified and brutal in a matter of minutes
  • Occasionally, magic normally not present in the area may briefly spawn, possibly causing interesting effects when interacting with other arcana
  • Objects and creatures may randomly change their position
  • The laws of physics sometimes break - gravity disappears in areas, water flows in completely wrong directions, objects may transform shape, etc.
  • Rarely, objects may have a paradoxical description - e.g. brightly shining objects that are pitch black
• At EXTREME levels:
  
  • Complete bedlam
  • Magic is hopelessly unpredictable. The entire region is a mad vortex of appearing, disappearing, waxing and waning magics from across the cosmos. Any spells cast in the area will have wildly unpredictable results, if they work at all
  • Everything is constantly changing position, size and shape
  • The laws of physics and logic are contorted beyond recognition, changing wildly with space and time
  • Objects and creatures frequently have paradoxical and oxymoronic descriptions

Creature effects:

• At ALL levels:
  
  • Creature's respect of LAW decreases, affinity for DISCORD increases
• At LOW levels:
  
  • Creature's values are more susceptible to change than normal
• At MEDIUM levels:
  
  • Creature's values are far more susceptible to change than normal, may frequently change for no reason
  • May sometimes do random actions for no readily apparent reason
• At HIGH levels:
  
  • Creature's values and facets are constantly shifting and oscillating chaotically, never staying in a single place for a significant time
  • Frequently does random actions for no readily apparent reason
  • Bodily features may randomly change into something else, rarely
• At EXTREME levels:
  
  • Creature's values and facets are always wildly oscillating, may become completely different in a manner of seconds
  • Is defined by constant, random actions that make no sense
  • Bodily features frequently change into something else, is basically a shapeshifter
  • May have paradoxical and oxymoronic features

If this gets added I'm going to become a master of chaos magic as soon as possible (adventure mode).

[voliol]

At extreme levels, why not grow an artefact instead?

Yeah, that's a better idea. I suppose the needed workshop (while workshops are still needed) would be a farm plot then.

There's interesting stuff to be found in the thread Sphere-based Biomes.

That's a nice thread. I vouch for putting all of those ideas on here, so it isn't all too spread out. Kudos to GreatWyrmGold, and other people contributing to the contents of that thread.

Alright ill have a go

MUCK

Spoiler (click to show/hide)

Spell effects:

    Rendered as a projectile, caustically causes burns or dissolves tissue according to spell strength
    Liable to be slipped upon causing falling down stairs and tripping onto the ground
    User can change the consistency of themselves and reform parts with enough magical materials and contact with filth

Environmental effects:

    At LOW levels:
        Filth like blood, vomit persists for longer, and things rot more slowly.
    At MEDIUM levels:
        Sources of water may become polluted and turn into dirty pools regardless
        Dirt can be cleaned but cannot rot away by itself
        A large portion of plant life may be overcome by ground-wells of fertility hampering murk clearing away grass
    At HIGH levels:
        The area becomes a hotspot for pestulence, bringing great swathes of irritating flies
        Surface plants refuse to grow, or offer very little yield.
        Fog Clouds of miasma
        Creatures greatly attracted by the sphere may manifest across evil planes leading to some otherworldy or supernatural intrusion.
    At EXTREME levels:
        The filth becomes a sentient god like force entity encompassing the biome, and may require negotiating with telepathically or through a slave intermediary.
        Occasionally this force may attempt to attack and outreach to other places to affect it with blight.
        Can only be killed by occultistic possibly artifact driven methods reserved for sealing away entities to limit power, like the Marigold Gauntlets of Cleanlyness to hold the filth within.
       Geographic changes such as pillars of solid filth reshape overtook villages with muck, plant life recedes almost entirely for fields of dirt.

Creature effects:

    At LOW levels:
        Boost to disease resistance, less acknowledgement of dirt and appearance
    At MEDIUM levels:
        High disease resistance, personality facets lean towards total carelessness, and ignores typically dirty surroundings
        Wounds are more likely to get infected but not impact general health
    At HIGH levels:
        Creatures almost always stay near sources of filth and rarely leave the biome on obsessive compulsion.
        Inheriently the features of the creature may be constantly covered with a layer of grime or dirt of some kind
        Cleanlyness offends them and may incur fights without being first dirtied in blood, filth mud and acceptable types, which may be difficult because of all the muck around which is uncomfirmed to be poisonous or dirty your existing wounds.
        Infected wounds heal over normally with minor scarring rather than serve to be fatal, almost all untreated attacks result in infection
    At EXTREME levels:
        Enslaved to the filth, people affected become cursed and bound to the biome akin to mindless zombies, souls claimed.
        Features entirely engulfed by muck, no longer require working bodies.
        Wildlife has all but left besides similarly thralled creatures, and monsters stalk the woods in larger quantities.

Object effects:

    At ALL levels:
        Interchangable effects of dispensing and moving dirt around it
    At MEDIUM levels:
         May be dirty to handle, comparable to other wizardry items but expels filth with less personal cost as a byproduct.
         May exaggerate or speed up the process of decay around it or slow it down based on the user's control over the object and intent.
    At HIGH levels:
        May be used as a catalyst for other magic, such as depravity sphere to increase potency or combine effects for veneral diseases.
        Item is slippery and leaves muck behind itself, may ooze all over its pedistal.
        Prolonged use or exposure may affect the mindset of the user.
        May disintergrate the user into living puddles of filth, granting temporary powers as long as they are able to return to their restored form
    At EXTREME levels:
        May be intrinsically linked to the filth force entity, as in its binding effigy of a soul or its means of being banished from this realm,
        Can inflict the filth curse anew upon lands until it is removed

Spoiler (click to show/hide)

Spell effects:

• Render as a mundane projectile, made of mud, filth, vomit, or another natural gooey material.
• Change one or several soil or stone tiles into some kind of fluid or semi-fluid muck, that creatures etc. might sink through.
• Transform fluids (both in tile form and stored in containers) into muck.
• Fill a bucket or other fluid-proof container with muck.

Environment effects:

• At HIGH levels:
  
  • Aforementioned dirty pools are instead filled with other kinds of muck such as filth, grime, mud or vomit.
  • Rainfall is either dirtied, or replaced by drops of filth and vomit.
• At EXTREME levels: Bigger water sources are sullied and turned into muck, including rivers and lakes. Streams keep their filth even after leaving the biome. An ocean aligned with MUCK may be made out of all kinds of filth.

Creature effects:

• At MEDIUM levels: Aquatic creature lives in aforementioned dirty pools.
• At HIGH levels: Aquatic creature lives in aforementioned pools of filth, grime, mud and vomit.

Plant effects:

• At EXTREME levels: "Plant" is an extension of the muck, made of whatever muck is prominent in the biome and growing only on it (e.g. "Mud bubble", "Vomit vines"). It is exempt from plant nullifying effects of the biome, but not necessarily ubiquitous just because it has no competitors.

Object effects:

• At LOW levels:
  
  • Object is constantly thinly laced with some kind of muck.
  • Inside of container is constantly laced with some kind of muck, infecting or muddying the contained item or liquid.
• At MEDIUM levels: Fluid-proof container fills up with some kind of muck within a time period of at least 1 week, either incrementally or all at once. The rate of filling also depends on the container's size.
• At HIGH levels: Fluid-proof container fills up with some kind of muck within a time period of under 1 week, either incrementally or all at once.
• At EXTREME levels: Fluid-proof container is an endless source of some kind of muck.

[Beag]

Another aspect you could speculate on is the possible costs and corruptions for spells associated with each sphere of magic.

[voliol]

Another aspect you could speculate on is the possible costs and corruptions for spells associated with each sphere of magic.

Judging from the screenshots and interviews on mythgen we've seen, magic costs seem to depend very much on the world, with the source of magic varying. If the source is a cosmic egg, the costs might be using up tiny egg shell fragments. If magic is found within each creature, the costs might be meditation to reach a certain state of mind, and doing a little dance to release it all. If magic is bestowed by the gods, appeasing them by sacrifices, praise, or sending food up a heaven-pipe might be necessary.

Of course, a spell that involves manipulating a fire still requires a fire, and one that transforms a creature into a tree needs a creature to work. I suppose some settings could necessitate having sphere-specific costs though, such as ones where the magic-granting gods subside on (sphere-specific) sacrifices, or ones where contacting the realm of PREGNANCY requires being close enough yourself somehow to the sphere of PREGNANCY. In general, I don't believe this will be used too much, but including it in this list would do no bad either, and I might also be wrong regarding that.
This also seems to be the same as "Rituals and enhancers" described in the top post, though I don't believe it has been utilized yet.

Corruptions are the same, varying a lot depending on the source of magic. If we want sphere-dependent ones though, there are already the creature effects, or environment/plant/object effects if it corrupts the user's surroundings instead of (only) the user.

I've always gotten an enormous kick out of the idea of magic associated with the Pregnancy sphere, especially with the community's well-known frustration with dwarven children and catsplosions.
Pregnancy

Spoiler (click to show/hide)

Spell effects:

• Temporarily increase the fertility of a female animal. This would allow them to produce offspring more quickly, but they would still need a male to give birth. This could last for a couple of months or years before wearing off. Does not affect semi-megabeasts, megabeasts, or civilized creatures. Useful for livestock breeding.
• Instantly induce labor in a female animal. Doesn't do anything long-term, but can be done without any male units on the map. Especially useful for animal taming.
• Increase the fertility of a female civilized creature for some period of time. They would still have to still go through the normal channels of marriage or extramarital lovers to give birth, but would do so at a greater rate. Could be useful for creating generational forts when dwarves don't marry at the rates you want them to.
• Instantly induce labor of a female civilized creature. Could be used in combat to severely distract and confuse the enemy, and killing their newborn child could act as a severe morale killer to the enemy if you happen to be a terrible person.
• The most skilled of pregnancy magic wielders can increase fertility of megabeasts and induce labor in them. This could be used to create an extremely powerful dragon army from just one female. Magic users of this caliber could even induce pregnancy in sexless creatures like forgotten beasts.

Weather effects:

• At HIGH levels: Blood rains, alluding to afterbirth and menstration. These have no effect.
• At EXTREME levels: Blood rains, increasing fertility in units that it hits, or can cause instant birth.

Creature effects:

• At LOW levels: Animal and vermin fertility is slightly increased. Both sexes are still required in order to breed.
• At MEDIUM levels: Animal, vermin, and civilized creature fertility is significantly increased. Think, dwarves giving birth every 9 months instead of every year. Civilized units are slightly more likely to become lovers/spouses
• At HIGH levels: Animal, vermin, and civilized creature fertility is hugely increased. Think, dwarves giving birth every six months. These units also experience periodic random pregnancies, which don't require a male. Gelding is the only way to prevent massive livestock explosions. The caverns must be constantly hunted in order to keep creature populations down. Your giant crocodile army will overwhelm invaders from numbers alone. Expelling all couples would be in the player's best interest to keep dwarven birth rates manageable, which will be hard because dwarves will be significantly more likely to become lovers.
• At EXTREME levels: Animal, vermin, civilized creature, and megabeast fertility is massively increased. Dwarves give birth every three months. Dwarves marry or become lovers very quickly. Random male-less births are more common, and even effect megabeasts and sexless creatures. Gelding does nothing. With extreme measures like expelling all females and bringing no livestock, the fort might last long enough to attract some megabeasts, allowing you to permanently increase their number in the world.

Spoiler (click to show/hide)

Spell effects:

• Ensure the safe pregnancy of a creature for a time period. Does not necessarily involve a safe birth.

Creature effects:

• At MEDIUM levels: Normally egg-laying creatures instead give live births, and thus are pregnant before that.

Plant effects:

• At EXTREME levels: Edible part of a plant causes the eater to become pregnant.

Object effects:

• At LOW levels: A worn object, clothing or trinket slightly lessens the risk of a miscarriage.
• At MEDIUM levels: A worn object, clothing or trinket moderately lessens the risk of a miscarriage.
• At HIGH levels: A worn object, clothing or trinket protects the wearer from having a miscarriage.

[Hapchazzard]

Will update the list later today. I also like the thread that someone else linked earlier in the thread, and agree that some of the stuff found there would fit very well here, though it'll take some time to filter, copy and reformat everything. I'll do that gradually for the spheres we already have sort of covered.

[Pillbo]

I've always gotten an enormous kick out of the idea of magic associated with the Pregnancy sphere, especially with the community's well-known frustration with dwarven children and catsplosions.
Pregnancy

Spoiler (click to show/hide)

Spell effects:

• Temporarily increase the fertility of a female animal. This would allow them to produce offspring more quickly, but they would still need a male to give birth. This could last for a couple of months or years before wearing off. Does not affect semi-megabeasts, megabeasts, or civilized creatures. Useful for livestock breeding.
• Instantly induce labor in a female animal. Doesn't do anything long-term, but can be done without any male units on the map. Especially useful for animal taming.
• Increase the fertility of a female civilized creature for some period of time. They would still have to still go through the normal channels of marriage or extramarital lovers to give birth, but would do so at a greater rate. Could be useful for creating generational forts when dwarves don't marry at the rates you want them to.
• Instantly induce labor of a female civilized creature. Could be used in combat to severely distract and confuse the enemy, and killing their newborn child could act as a severe morale killer to the enemy if you happen to be a terrible person.
• The most skilled of pregnancy magic wielders can increase fertility of megabeasts and induce labor in them. This could be used to create an extremely powerful dragon army from just one female. Magic users of this caliber could even induce pregnancy in sexless creatures like forgotten beasts.

Weather effects:

• At HIGH levels: Blood rains, alluding to afterbirth and menstration. These have no effect.
• At EXTREME levels: Blood rains, increasing fertility in units that it hits, or can cause instant birth.

Creature effects:

• At LOW levels: Animal and vermin fertility is slightly increased. Both sexes are still required in order to breed.
• At MEDIUM levels: Animal, vermin, and civilized creature fertility is significantly increased. Think, dwarves giving birth every 9 months instead of every year. Civilized units are slightly more likely to become lovers/spouses
• At HIGH levels: Animal, vermin, and civilized creature fertility is hugely increased. Think, dwarves giving birth every six months. These units also experience periodic random pregnancies, which don't require a male. Gelding is the only way to prevent massive livestock explosions. The caverns must be constantly hunted in order to keep creature populations down. Your giant crocodile army will overwhelm invaders from numbers alone. Expelling all couples would be in the player's best interest to keep dwarven birth rates manageable, which will be hard because dwarves will be significantly more likely to become lovers.
• At EXTREME levels: Animal, vermin, civilized creature, and megabeast fertility is massively increased. Dwarves give birth every three months. Dwarves marry or become lovers very quickly. Random male-less births are more common, and even effect megabeasts and sexless creatures. Gelding does nothing. With extreme measures like expelling all females and bringing no livestock, the fort might last long enough to attract some megabeasts, allowing you to permanently increase their number in the world.

Spoiler (click to show/hide)

Spell effects:

• Ensure the safe pregnancy of a creature for a time period. Does not necessarily involve a safe birth.

Creature effects:

• At MEDIUM levels: Normally egg-laying creatures instead give live births, and thus are pregnant before that.

Plant effects:

• At EXTREME levels: Edible part of a plant causes the eater to become pregnant.

Object effects:

• At LOW levels: A worn object, clothing or trinket slightly lessens the risk of a miscarriage.
• At MEDIUM levels: A worn object, clothing or trinket moderately lessens the risk of a miscarriage.
• At HIGH levels: A worn object, clothing or trinket protects the wearer from having a miscarriage.

There are lots of interesting negative ways that this could work out too, I imagine:

Spoiler (click to show/hide)

Spell effects:

• Spontaneous abortion spells (like asking your pregnancy god to take your enemies pregnancies away)

Creature effects:

• Medium levels -  semi-permanent pregnancies, amount of twins and triplets increasing
• High levels -  unending pregnancies, pregnancies lasting until the child enters adulthood, twins and triplets the norm for humanoids, male pregnancies,
• Extreme levels - Humanoids giving birth to "litters" of young (octodwarf moms),
• • Creatures giving birth to other creatures (dwarf with a goblin, human with puppies, unicorn with beak dog)
• • Creatures giving birth to plants (elf giving birth to trees)
• • Creatures giving birth to items / gifts from the fertility god
• • Creatures giving birth to an artifact

Weather effects:

• Low - Fogs/mists that impregnate
• Low - Fogs/mists that cause miscarriage
• Med - Fogs/mists that impregnate males too
• High - Fogs/mists that impregnate creatures with any random creature/vermin (Pigs explode giving birth to orca, ect)

Plant effects:

• At extreme levels plants giving birth
• 
  Item effects:
  
  • At high levels items that will impregnate someone with a previous owners child, or items that curse with permanent pregnancy or cause miscarriage]
  • At Extreme levels items that will impregnate someone with other items
  
  
  That's probably not balanced well but oh well it's brainstorming.  I'm not sure how the system will work in the end but overlap with other spheres like Deformity, Chaos, etc- or evil- or savage could bring all kinds of interesting effects.
  
  

Edit- oops didn't mean to post yet

[Pillbo]

DEFORMITY

Spoiler (click to show/hide)

Spell effects:

• Spells that cause deformity (duh), tumors, growths, "elephant man" type physical effects- bones bending, mouths or eyes growing over with flesh or bone
• Spells that cause deformity in plants.
• Spells that cause out of control growth in plants.
• Spells that rob someone of their beauty.
• Spells that turn beautiful objects into ugly objects, or objects that are difficult to look at/cause disturbance.
• Cursed items that make people repulsive or become deformed

Environmental effects:

• From LOW-HIGH levels:  Increasingly misshapen landscapes, broken mountains. Maybe canyons or mountains that don't make sense, as in not formed by water runoff in logical ways. I don't have much specific for this, but anything can be deformed. Increasingly negative mood effects on creatures
• At MEDIUM levels:  All natural beauty is gone. The environment makes creatures feel physically repulsed/disgusted. Elves couldn't be here, goblins would maybe like it?...
• At HIGH levels:Mountains that get wider as they increases in elevation like globes. Rains toxic and deformed vermin. Stone & soil in the earth becoming increasingly crude oil, uranium, plutonium, mercury, basically anything horrible.
• At EXTREME levels: Rivers of mercury, lakes or oil and tar, everything is radioactive, soils are coal dust, aquifers of oil, rains oil, tumors, gore

Creature effects:

• At LOW levels: Unusual effects on newborns and long term residents, hair all falling out, eyes or teeth enlarging, bulbous features
• At MEDIUM levels: Everyone/thing is ugly/unsightly. Children born with missing or extra body parts. Conjoined twins/triplets/ect. Some creatures don't ever stop growing their whole lives
• At HIGH levels: Extremely hazardous to creatures, tumors grow wildly on just about anything, Civs will no longer consider animals edible out of disgust. Creatures born with mismatched (for their species) body parts (dwarfs with squid tentacles, puppies with turtle shells, elves with beards).  Marriage, romance, pregnancy all become almost unthinkable in this environment, insanity high.
• At EXTREME levels: Every living things is horribly mis-formed and barely able to live at best. creatures like floating guts, demons, elementals, blobs, jellys and about all that can live here.  Creatures are lumpy and tumor-like losing most of their original shape. Creatures continuously melt/grow into/split off of each other in a Cronenbergian hellscape. Literally hell on earth?

Plant effects:

• At LOW levels: misshapen fruits/seeds
• At MEDIUM levels: bulbous plants, trees growing wider and shorter
• At HIGH levels: All beauty is gone, civs will no longer consider plants edible out of disgust. trees growing along the ground in snaking strange ways, with large wide then skinny sections, fruit growing from trunks of trees/wrong parts of plants. Trees grown fast and entomb objects like swords, armor and corpses left in a field after battle.
• At EXTREME levels: trees growing trunks like a starfish in any direction up, down or to the sides; some huge bulbous trunks with virtually no vertical growth, trees growing upside down, fruit and leaves growing from roots, roots growing up into the sky. Some trees no wood, just bark growing tumor-like from the ground. Trees replacing the ground like a shell, a thick, solid, woody groundcover

Item effects:

• At LOW-HIGH levels: Items increasingly lose functionality to deformity
• At HIGH levels:  Items become unsightly and repulsive, function is greatly reduced.
• At EXTREME levels: Items become nonfunctional from deformity.

Pregnancy

Spoiler (click to show/hide)

Spell effects:

• Spontaneous abortion spells (like asking your pregnancy god to take your enemies pregnancies away)

Creature effects:

• Medium levels -  semi-permanent pregnancies, amount of twins and triplets increasing
• High levels -  unending pregnancies, pregnancies lasting until the child enters adulthood, twins and triplets the norm for humanoids, male pregnancies,
• Extreme levels - Humanoids giving birth to "litters" of young (octodwarf moms),
• • Creatures giving birth to other creatures (dwarf with a goblin, human with puppies, unicorn with beak dog)
• • Creatures giving birth to plants (elf giving birth to trees)
• • Creatures giving birth to items / gifts from the fertility god
• • Creatures giving birth to an artifact

Weather effects:

• Low - Fogs/mists that impregnate
• Low - Fogs/mists that cause miscarriage
• Med - Fogs/mists that impregnate males too
• High - Fogs/mists that impregnate creatures with any random creature/vermin (Pigs explode giving birth to orca, ect)

Plant effects:

• At extreme levels plants giving birth
• 
  Item effects:
  
  • At high levels items that will impregnate someone with a previous owners child, or items that curse with permanent pregnancy or cause miscarriage]
  • At Extreme levels items that will impregnate someone with other items
  
  
  That's probably not balanced well but oh well it's brainstorming.  I'm not sure how the system will work in the end but overlap with other spheres like Deformity, Chaos, etc- or evil- or savage could bring all kinds of interesting effects.
  
  

+Environmental effects:

• From MED-HIGH levels: Mountains forming rounded like pregnant bellies. Rounded volcanoes "the earth giving birth" would be cool if volcanoes ever erupt in game.

Creature effects

• From MED-HIGH levels: All creatures beginning to appear pregnant even if not.
• From HIGH-EXTREME levels: Trees giving birth to elves. Volcanoes birthing dwarfs. etc