Zenith Project (also stylized ZεNITH PROJECT) is the series/universe that all my characters are currently in.

It is still a work-in-progress. The basic premise is that it is a world inhabited by gods, demons, celestials, and humans, some humans being magicians. All magic (which takes on the form of abilities to play with a certain idea) can be derived from human cognitive processing of the world, from science to art to bygone social beliefs. No two people can have the same magic ability. It is this power that gods (in their current form), demons, and celestials are able to exist, though the last of those are unprecedented and thus, carry great ability to upset the balance of the world.

All beings live in different levels. The general rule is beings can view everything in levels underneath theirs, though beings on different levels cannot physically interact with each other.

Humans, half-celestials, and celestials have the ability to manipulate what level they are on. However, they are limited to as high as their normal state of living is in, IE humans cannot bring themselves to gods' planes.

Gods are a representation of a particular concept and are unkillable so long as a concept exists. They exist on a separate, higher plane than humans, but they cannot traverse to lower levels. They can communicate with humans only through specific mediums and procedures.

Demons are on the same level as humans and cannot do any level manipulation. Like gods, they are tied to a concept, in this case, negative human emotions and fears. Unlike gods, all demon concepts were created by humans, so they feed off them literally or by festering more of their concept in the world.

Demons and gods to a degree only exist because of humans, so despite being disinterested or at odds, they will protect humans in dire times.

Celestials were former humans who used their power of belief to elevate themselves to the status of gods. They live indefinitely and are immune to all poison and disease, but due to their unnatural status, they simply disappear when they die. Celestials, despite originating from humans, are no longer human and are unable to tap into humans' innate power.

The full steps to become a celestial are unknown, but "severing humanity" and to be a magician are vital to it. Magicians are more tied to the innate human power, which is used to turn someone into a celestial. Their magic doesn't disappear when they become celestials, however; a celestial "copy" of the ability is made, and the human variant of said ability is now free to use.

Half celestials are the offspring of a celestial and a human. Tentatively, they are classified as humans than celestials, though they have superpowers and physical capabilities that far exceed that of humans. If the god/celestial level is 2.0 and humans at 1.0, then celestials would be at 1.4, which would round down.