[quote=TheSovereignGrave]
Huh, just curious, have you played Morrowind? because I've been playing a lot of it lately and the main villain makes people insane and part of his cult via sending them dreams. I was going to make a Prince like that before deciding on my current one.
[/quote]

Never played Morrowind, no.

The idea with Irilith (which obviously would have needed adjusted for this) was basically she was queen of her people and figured out a way to empower herself by channelling emotional energy through rituals. So she formed a state religion that encouraged more and more excessive and hedonistic displays, opulent rituals, and blood rites. Eventually the power she accumulated reached critical mass and she broke reality around herself, transforming into a blinding serpentine god-queen that psychically mind-raped all of her followers within lightyears.

Her bubble of control gradually expanded, and within it reality was shifting and fluid and her whispers kept all the survivors adhering to her will and the will of her Dream.

It was all rather Slaaneshi (at least as far as her birth went), with a lot of inspiration from Chaos.