Bastion Stair and Slaurith
Slaurith
is mob from Bastion Stair (its firt mob i saw in Warhammer anyway) . He was once a great knight, one of the elite of Knight of The Blazing Sun, but consumed by his will to have unlimited power he become one of Blood God Khorne servants. After dark deal with Khorne, he becomes one of most terrible of his champions, like Arbaal The Undefeated or Egrimm Van Horstman.
Fortress - Bastion Stair
This fortress is somekind of link beetwen world of mortals and world of Khorne- one of the Chaos Gods. This monstrous citadel is full of most terriffing deamon like Bloodthrister ( its most powerfull deamon of Warhammer World) or Chaos Champions like Slaurith- corrupted Knight of the Blazing Sun. Bloodthirster watches dark portal, he is guarding it and whoever wants to destroy it or take its power ( Order or Destrution ) must confront him first. His power can be matched with great deamons like, Great Unclean One, Keeper of Secret or Master of Changes..