i gotta talk about wuya's eye.
so in wuya's OG lore, she is a villain. she was a pariah, loathed by gods and men alike. punished for her willfulness, and rebellious nature. like she absolutely refused to step down or compromise even a little bit. and killed a lot of people for her freedom. or at least what she perceives as freedom / the freedom she wants.
a list of her crimes include:
patricide
matricide
the slaughter of her entire sect
hunting and killing heavenly officials
killing innocents ??? ruining mortal lives ???
cursing people / forming curses
stealing from the heavens
stealing immortal wine
stealing the eye of bai/ze for knowledge and foresight
that's only a few. but that last one is pretty big. and just as a warning, i DO take some small creative liberties for my character building and world lore- but that eye is important. bai/ze is a divine creature, said to have supreme cosmic knowledge of the past and future. among a great many other amazing things,,, and i think for my personal stuff it's much the same. it was no easy task, but wuya being a cunning crow and quite skilled- plucked it's eye from it's head and placed it within her own.
this was arguably the worst crime she committed. everything was pretty bad, but considering how revered bai/ze is, and what it stands for ... well.
anyway in short.
this eye grants wuya the ability to see the unseen, to perceive energy and hold an understanding of ghosts, curses, and the divine she didn't before. as well as a small glimpse into various possibilities. it is probably her strongest tool. and in most verses / settings it is bound to her flesh and blood- no matter how many times she reincarnates.