Rider in Red

The Rider in Red is believed to be the personification of the Blood God himself. Though the particulars vary a great deal—sometimes he appears to be a Knight adorned in red armour and others he’s nude with flaming red skin—he always riding a black steed that exhales plumes of smoke from its nostrils and causes sparks to appear when it stamps its feet. Its harbinger is the smell of brimstone and the sound of deep rolling laughter.

Also Known As: Blood Knight, Fleshrender, Hell King

Attracted By: Bright Magic, Destructive Spells, Cruelty

Source

 * Warhammer Fantasy RPG 2nd ED -- Tome of Corruption pg. 209