I modify some mundane life to heavily feature additional eyes in various locations. Horses might have eyes on their flanks, trees might sprout eyeballs instead of leaves or have eyes in their trunk, birds might have eyes in their wings, elephants might have eyes in their legs etc. These eyes are fully functional, and even have tear ducts. Many different types of eyes. Compound, lense, patches of photosensitive cells, those weird eyes trilobites have and with varying pupils and looks etc.
Create the Oracles, massive singular eyeballs hanging from floating bags of gas. They keep watch over all events that transpire on the surface of the word below with rapt attention and ultimate eyesight, storing it in their prodigious memories. Their bodies brightly glow gold and green, alternating between these two colours in pulses. Several tentacles like those of a jellyfish hang down from their main mass. They feed on sunlight, ambient magic and any birds that happen to be caught in their tentacles. If a intelligent being's gaze meets with that of an Oracle, the Oracle will send a vision to the mortal, visions of the past. These visions aren't related to the mortal's current location and can be near anything. Grand battles that the Oracle happened to witness, the birth of a baby, a lion bringing down a deer, a particularly dazzling sunset. If something tries to attack the Oracle, it can incapacitate them with strong visions of horror or the like, or try to inject them with the paralyzing digestive venom of their tentacles. Oracles are immune to gaze attacks of any sort, with the sole exception being that of other Oracles. Oracles will often exchange visions with each other if they meet
Create the Magma Wyrms. Great fleshy worms covered all over in eyes. In their fledgling state they swim around in lava, often playing around in the calderas of volcanoes. Once they become adults, having reached an immense size, they have an intense urge to swim down the magma tube into the mantle, dwelling there for a while, rapidly swelling in size unrestrained, then burst forth from the crust at another location, forming a new volcano. This is quite a draining affair and large amounts of flesh and eyes are torn off while they tear a hole in the crust. These gobbets then slowly regenerate, growing into new fledgling Magma Wyrms. Having spent many years swimming in lava, absorbing the magical energy, the Aether, welling up from the center of the planet, the Wyrms are quite powerful. Once they have become adults and gone through the volcano birthing, they go into pained frenzies, causing massive wildfires with their pyrokinesis abilities. They then immerse themselves in these blazes, being healed by the flames.
During these firebaths, they undergo a dramatic rebirth, their fleshy skin becoming hard and scaled, while their size, already diminished by having parts torn off during the re-emergence from the mantle, shrinks further. While unable to repeat their acts of volcano creation, they become much better suited for digging, no longer tearing off pieces of flesh when moving through hard rock and quickly dive back down into the earth, where they are fond of seeking out gems and metals and devouring them, these metals being incorporated into their body either as decorations or reinforcement, their scales becoming iron edged with gold, their teeth replaced with titanium reinforced diamonds, for example, or their eyes covered with jeweled lenses to protect them.
At this Apex stage they are known as Metal Wyrms. Metal Wyrms do not die of age, and continue to grow larger and stronger. Magma Wyrms possess strong abilities of fire manipulation, while Metal Wyrms possess abilities of Earth and Fire Manipulation. They die immediately if fully submerged in water, but are otherwise tough to kill, possessing significant regenerative abilities and extreme resistance to physical and magical harm. In addition, looking into any of their eyes causes extreme fear in the looker.
Create the amphibious Eyebeasts. Titanic slugs who possess 8 eye stalks/tentacles/feelers, two stalks on the head, with the remaining being situated in pairs down the length of the body. Different Eyebeasts vary widely in colour, from dull browns all the way to garish patterns of brightly clashing colours. The powers of their eyes varies as widely as their colour, though specific eye powers are not linked to specific colours. One might possess the relatively harmless ability to make anyone it sees fall asleep, another to set anything it sees aflame, or freeze it. The abilities can range from something as mundane as causing hiccups to killing anyone who sees the Eyebeast.
Eye abilities are divided into three types: Outwards, Inwards, and Mutual. Outwards are caused by the Eyebeast looking at things. For example, looking at a bush and causing it to catch fire. Inwards is caused by looking at the Eyebeast, for example: catching sight of a slug and dying. Mutual is caused by the gazes of the Eyebeast and the victim locking: for example, turning to stone when locking your eyes with that of a slug. Each eyebeast possesses all three variants, but each specific type may be something different.
One Eyebeast, may set fire to anything it sees, cause hiccups in anyone who locks gazes with it, and cause anyone who looks at it to fall asleep for example. Looking at an eyebeast indirectly, such as through a mirror, weakens the effects of the Inward and Mutual Gaze attacks. However trying to filter it while still looking directly at the Eyebeast, such as by wearing sunglasses does not work. Looking at an Eyebeast through the Lenses of Sight protects against all three types of gaze attacks as long as you don't look at it with your normal eyes.
Having the Eyebeast see itself in a mirror will subject it to its own gaze attacks, though weakened depending on the quality or potency (if magical) of the mirror. If you were to approach a Eyebeast behind a massive mirror Tower Shield you would theoretically be safe from it. Water reflections don't have this effect.
Example Gaze powers may include but are not limited to : Causing Blindness, Death, Hiccups, Sleep, Spontaneous Combustion/Freezing/Melting/Sublimation, Memory Wiping of anything relating to the Eyebeast, Magic Destruction, Stop Magic from Working, Mind Control, Telepathic link between slug and victim, Muteness, Insanity, Infection with various different Diseases, Deafness, One Random Limb Exploding, Petrification, Paralysis, Granting a random Gaze Attack Ability to the Victim, Sterility, Resurrection, Healing, Permanent Transformations (e.g. into a toad), Magical Curses, Change Gender and Feeling Hungry.
The abilities of offspring of an Eyebeast is random and completely unrelated to the parents own abilities. For this reason Eyebeasts will try to get as far away from their eggs as possible when they lay them, and lay them separately from each other, for there is no knowing which Eyebeast might possess killing abilities once hatched, and inadvertently kill the parent or siblings. As such the life of an Eyebeast tends to be a lonely existence.
Eyebeast mating tends to be cautious affair, and they tend to be largely solitary as a result of their powers. Eyebeast slime trails are very noticeable and can contain all sorts of information, most pertinently the gender of the Eyebeast who made it. Once a Eyebeast detects an Eyebeast of the opposite sex, and wishes to begin courting, they will cautiously follow the trail, trying to get closer to their potential mate. Once they get as close as their caution allows, they will retract all their eyes and begin releasing mating pheromones. If their opposite number picks up on these and is interested, they will begin moving towards the source of the pheromones, also retracting their eyes once they get closer. Unable to see each other, and thus unable to trigger gaze attacks, they will then mate in blindness, never seeing their partner and quickly separating from each other again.
The process does not always go this smoothly however, and two Eyebeasts may spend months indirectly courting each other through scents and intersecting slime trails before finally doing the deed.
(Unlike mundane slugs Eyebeasts are not hermaphrodites, though an Eyebeast with a Gender Change gaze ability may try to force the creation of a mate if it has trouble finding any, though this is of course risky.)