then what is life?
That which is living. A metaphysical trait.
does that mean you just gave it some form of life?
Depends on the setting, but yeah. Golems for example.
A) If magic is expensive to learn, yet everybody has potential, then WHAT is exactly expensive? Using it? But then what's the expense? What happens when you try to learn it on your own?
In some settings magic requires very expencive ingrediants like grinding up rubies and diamonds. This could be on a spell for spell basis or it could be that it requires large expencive foci (for example a tower to channel magic from laylines)
C) Yet everybody has it in them? I don't see how that works. If not everybody had magic potential, then yeah I could see it, but when everybody has it, then why would it be rare?
because I was seperating different types of reasons why someone wouldn't have magic spells. Though it can be combined. If magic is very expencive but a few people have an inate ability to, for example, light campfires with a touch without wasting valuable resources, that would be a AB combination.
D) Makes sense, but doesn't really work in the game. Would make it a bitch to become a mage. Maybe that means it does work in the context of the game? Like Necro powers? I don't know what I think about this one
It sort of REALLY works in this game. This is a magical world brimming with creates of magical and godly might with dieties just walking around.
E) Also makes sense, but then what is the cost? You can't be turned evil, because who is to say you're evil when much of the game is what you think about it?
In the story the main character from using the Death Touch was haunted by Boogeymen and hinted that he was likely going to die or need to get rid of his curse from using that magic.
Other costs could be a risk that a demon could possess you, you could start to age rapidly, your health could start to decay, you could be turned into another possibly harmless creature, You COULD be turned evil and unplayable (I have no issues with your character becoming unplayable if you ever lose your mind), people could start irrationally hating you, you could get deadly bad luck, really bad fleas... Anything really works.
Why does using your real energy make less sense to make magic than some magic fuel or stored magic?
Because it actually makes less sense to convert something inherantly unmagical into magical energy then it is to simply take magic that already exists and focus it into a purpose.
Why does your bodies chemical processes get turned into magic?
It is like putting battery acid into a steam acid expecting it to run.
It ONLY works in settings where... Once again... Everyone is magic. It is why most settings that use a Stamina to Magic mechanic have it so that the fatigue is either because of "Equivilant exchange" (Where magic dictated that you had to be exhausted) or because it isn't fueling magic but rather the fatigue represents the stress your body goes under performing magic. Heck one explained it simply by saying Ki and magic are similar if not the same thing (and given that Ki is part of someone's life force... Yeah)
Where do you get your magic? Do you have to eat special foods?
Actually I have seen settings where that happened.
right now I'm really trying to understand how mana would work. To me, mana is a pretty worn out idea. That we don't normally need to be told that the blue bar is mana and the red bar is health in a game must mean something is wrong. We don't have the red bar in DF, so why would we want to give ourselves the blue one?
We have a stamina bar and not a HP bar. I don't percieve magic to work on such a straight forward basis.
Mana is a cliche because mana makes the most sense and is the most straight forward representation for simply the stored magic within someone without magic simply being endless.
If Stamina is what is used to fuel magic then you just made Stamina a Mana Pool.
I just wouldn't want being a mage to be something that you have to plan ahead for.
You really will have to, ignoring that Toady has some reservations on magic adventurers, since spells won't all be given to you. You will actually have to think about what you are going for and what you are willing to risk.
Also Remember this is Dwarf Fortress... There is NO reason why your wizard cannot kick butt with a sword as well. In fact it will probably be expected.