Zarakynel

Zarakynel is Slaanesh's Bringer of Torments, Souleater, Unholy One, Angel of Despair: a Keeper of Secrets that specialises in Aeldari as a vintage. Where N'Kari wants a stage and Helbane wants a duel, Zarakynel wants the last scream in a craftworld's throat.

Exodite worlds and maiden gardens have learned that a beautiful visitor can be a harvest. She is named in the old songs as a personal debt, not a random disaster. Spiritseers who still sleep do not sleep well after reading those verses.

Slaanesh has many keepers. Zarakynel is the one the Eldar wrote down, which is how you know the bill is personal.