Darkfallen Blood Knight

Darkfallen Blood Knights can be found in the Crimson Hall of Icecrown Citadel. They are normally found spread out among the trash in the halls.

Abilities

 * Vampiric Aura - Melee strikes heal the attacker for 4500 to 5500.
 * Blood Mirror - Links target with another random raid member. All damage taken by one linked player will cause equal damage to the other linked player, similar to the mechanic for Blood-Queen Lana'thel.
 * Unholy Strike - A brutal attack that instantly strikes the enemy, causing 150% weapon damage.

Speculation
It is unknown if these mobs are intended to be former members of the Blood Knight order, considering the Lich King himself ordered Dar'Khan Drathir to kill Blood Knights and raise them as undead, or if they are just another mockery to cause more rage in the hearts of possible Blood elf heroes since they could also be fallen paladins or warriors from the original Northrend expedition of Illidan like their Queen.