By his mortal name, Hashmet Vome, by his daemonic form name, Malefactor, goes by such abominable titles as:

Walker of Helway, Something Wicked, The Bastard of Golgotha, Defiler of Saints, and Conduit of Horror.

Malefactor is a bastard of the highest caliber, his favorite things are abducting women for sacrifice, exposing everyone to the true eldritch horrors of the warp from his giant chest wound/portal, casting spells, and being an absolutely reprehensible monster, but hey alls fair in the name of Slaanesh.