Literature
Magician Shadow Arcana Idea (Rough)
This entity is known as "The Brainwyrm", which is inspired by brainworms, or rather, ideas and beliefs that can lead to delulu being seen as a solulu.
Basically, it's something of a being that resembles a sort of cosmic jester and magician mixed with a writing parasitic eldritch worm and it has a humanoid face and disembodied gloves for hands.
It's a being that's work under the Muse of Darkness is to create, and reinforce, vanity to lead into despair, to turn the knowledge, truth, the air waves, and the dogma of the world into nonsense and lies and just enough distortion to trick people into believing they're doing good when they're actually doing very messed up things, under the idea that "inferior beings" and, in it's own eyes, their perceived meaningless, should only inherit and learn and be drive to a meaningless world of rot and corruption and madness to prove that the knowledge and power that were shared by it's realm, as well as the creation's free will and ability to decide
