AETHER, as opposed to psionics, is widely looked down upon, treated as black magic, and only officially taught to very specific lines of work and research. It isn’t dependent on Willpower or the mind, and can “infect” anything that exists, warping and corrupting and changing it - even if no one is around to perceive or dictate it.
Anything - sophonts, animals, plants, machines, objects, etc. - can be affected by Aether. The presence of a mind does not matter.
Aether is, then, the opposite of nature - it is artificiality made manifest. Aether is not physics, but rather, feelings and desires, tearing holes into reality to make it come true.
Aether’s source is a substance known as ARTA. Arta looks like something indescribable; often called a dark rainbow, it is both every color and no color, presence yet vacancy, liquid yet dry. It doesn’t feel like anything, yet it could also feel like everything. The perception of Arta is very strange, and it’s a lost cause to even try and understand it.
“Arta” is a word that opposes VITA. Where Vita means life, Arta comes from artificial.
Arta, however, can be gathered, modified, and turned into other states. Arta is the pure, unfiltered state - but the Everchangers can biologically gather and transform it without being outright corrupted into ruin.
When turned into a biological solid, Arta becomes EGO. Ego is a metallic-like structure that can be carved and molded into specific shapes, and can be found within an Everchanger’s (or most notably a Kraizen’s) body as teeth, claws, spikes, and other unique body details. Ego’s properties allow it to be turned into an “enchanted object”, making anything built or otherwise crafted with it (such as weapons, tools, or machines) have properties beyond that of nature.
Another form of processed Arta is DRAGONFIRE, the silk of Dragons. Unlike the main lineage of ECs, Dragons cannot store it in their bodies without it making them very sick. So, instead, they have developed special spinnerets that allow them to breathe a silk-like processed form of Arta in order to affect the world around them with controlled, subtle Aether.
Where Dragons roam, the world becomes a fantasy world of dreams and wonder - because of the Dragonfire mist making the world itself fantastical.
Ego, specifically, is used as a refined material to make machines like Automs and Amplifiers with, to allow them to be “magical” machines despite lacking true brains. It must be in very specific, special quantities, lest it risk corruption overflow.
Research into artificially refining Arta has been in the works for generations. While there has been some progress, it’s still a highly dangerous venture, and considered one of the highest risk careers in the universe. Due to the dangers of handling raw Arta, most choose to either use already-processed Ego or Dragonfire - both of which do require the death of or at least the harvesting of ECs. Vani have been hunted, both for the simple fact of being a Vani, as well as for their Ego for testing and usage.
Too much Aether (hence Arta) in an area will create DEMONS. Too much Aether within an individual will warp them into a REZNAXAN, a monstrous corrupted form with loosening ties to nature and the Ocean.
Aether does not inherently hurt someone to be affected by. However, Aether and subsequently Arta will “seep in” and worsen wounds and trauma, treating them as a sort of easy avenue to enter by and flood. Thus, Aether is often mostly associated with pain and suffering, despite the fact there are known peaceful and silly instances of it.
There are many organizations dedicated to the containment, research, and usage of Arta/Ego/Aether in general. They are dedicated not just to handling and neutralizing it, but to study it, and better understand this anti-universal material and ability.
Though stigmas remain, scholars do realize that Aether is not a force of evil - just chaos.
An example of NEUTRAL Aether manifestation would be, to oppose psionics’ logic, a simple vase. This vase is empty unless turned over, for which it then constantly and continuously dispenses a waterfall of water. This water has no summon source, and it is being actively generated. The water could be good and hydrating, but it could also flood a room. Ultimately, it is simply water.
An example of GOOD OR USEFUL Aether manifestation would be a house that is much larger on the inside than the outside, creating a home with immense storage space. Another example would be enchanted objects, such as paint that never empties, ice that never melts and keeps your drinks cool, or toys that wander about by themselves without batteries.
An example of a BAD manifestation of Aether (besides most trauma-induced Rezna) would be warping a land to be an ever-shifting labyrinth, making it downright impossible to leave, for it has no exits. Perhaps also flames that freeze, a forest perpetually on fire, blood that takes and reaches out… unfortunately, in the era of Vani, Arta has been abused for the worst a lot.
...Interestingly, though it’s largely chaotic and not able to be messed with by Willpower, it seems emotions do have a sort of tangible effect on Arta, and thus Aether. This must be why so many Rezna have been occurring in the wake of the Vani. Negativity bias will make Arta seem like a substance of evil, when in reality, it is purely neutral - just chaotic.