Parallax Worm

Parallax Worms, or "the soul" as dubbed by Sin, these beings reside in every human, gathering their every emotion and personality trait from the human they inhabit. They are also the ones that grant the user a Psyche.

Overview
Parallax worms are small white worms with different amounts of rings, depending on the strength of the worm or how many the user has devoured. They are about the size of a paperclip and are located beneath the occipital bone of every human. They do not react and do not move when removed from an incapacitated human and do not act before eaten. When eaten, the former user either dies or goes into a catatonic state, rarely recovering. This worm cannot be taken out by normal hands, and only by those who have psyches themselves.

These worms were granted by Sin, who saw this as a chance to use humans as test subjects, seeing what the limit of the human mind could produce with a psyche. Around 10AD, the humans were able to rise up and use their psyches to vanquish the terrifying god, but only sent it hiding, ending all active users of psyches by deactivating all parallax worms, requiring a weapon with a strong psyche bond or a cause waking the worm up.

Inheritors

 * God Wolf: Ate his own Parallax Worm to stop himself from becoming a vessel for Sin
 * Angelo Corciani: Ate part of Crimson Wolf's in order to gain the memory of how to perceive Sin and how to beat him
 * Red Wolf: Ate Angelo's worm as a child unknowingly and Atlas's. He also devoured Basilisk's worm out of sheer anger and fury.
 * Renegade Wolf: Ate a section of Darling Wolf's worm in order to see the chance of leaving Sin open wide.