Olrun the Battlecaller

Olrun the Battlecaller is a val'kyr found at Death's Breach. She instructs death knights that they must complete a rite of passage, one that originated from Arthas' victory over Illidan at Icecrown. She appears to also be watching over the pit of corpses.

Olrun's status after the Acherus revolt and Fall of the Lich King is unknown.

Quests
She is involved in the following quest:
 * Death's Challenge

Speculation
She may now serve the Forsaken as one of the last remaining Val'kyr or could have been killed during the Acherus revolt or at any point during the war against the Lich King.