Juggernaut

Known as Blood Crushers, Soul Crushers, Feet of Khorne, Juggers, and Blights of Khorne, the Juggernauts are a mix of Daemon and machine, used as mounts by the mightiest of Champions. These four-legged beasts blend the features of canine and bull but are covered in profane armour formed of a fused mass of flesh, bone and metal. Though they may look more machine than beast, beneath this heavy Khorne-marked armour is the war hungry heart of a vicious Daemon. When encountered alone, it is because their rider was slain. A loosed Juggernaut could wipe out an entire village to say nothing of a small force of adventurers.

Source

 * Warhammer Fantasy RPG 2nd ED -- Tome of Corruption (pg. 224).