Varak'suul
From Warhammer 40k - Lexicanum
Varak'suul, the Murder of Thrymyr, was a Daemon who took part in the Horus Heresy's Siege of Terra.[1a]
Varal'suul was birthed from the guilty pleasure felt by a murderer on a world that later died in the Old Night.[1b]
She briefly served as a courtier in the Halls of the Wilfully and Ecstatically Blind before fleeing it and its intrigues and instead wandering the further reaches of the Realms of Chaos.[1b]
She was later summoned along with many other of Slaanesh daemons to fight on Terra in the Siege of Terra.[1b]