Amin'Hrith is a Keeper of Secrets, a Greater Daemon of Slaanesh. It has tempted many mortals into damnation in its various schemes. It took the name Soulflayer after the Battle of the Winter Grove, in which it slew over a hundred Wood Elves and created a long, five-headed whip from their flayed skins.
It did not take part in the attack on Karak Vlag, although it did witness the Dwarf army of Anarbarziz on the surface of a golden mirror in the Palace of Pleasure. It began the Hunt of the Vlagians with the ambush in the Bloody Spires, before allying with the Lord of Change the Eldritch Watcher and attacking Ar Anrak. This led to the Battle of Death Canyon, which saw the deaths of the last Dwarfs of Karak Vlag.