History of Xir-Kuur

'''Xir-Kuur''' is a Hive Knight of Xivu Arath's horde, ranked Ultra, who challenged Oryx under the Sword Logic and was defeated and Taken. Xir-Kuur rejected Oryx's offer of power because it felt unworthy of it, so the being split into a Hive identity (Xir-Kuur, Not-Taken) and a Taken identity (Xir-Kuur, Taken), which stayed in the Dreadnaught for millennia.

Overview

Xir-Kuur is the boss of Derealize, the Exotic mission from Episode: Heresy. The mission is unlocked after finishing the Taken Path Exotic quest and is reached from the Director's The Last City node.

Encounter

Taking the Barrow-Dyad from the desk and destroying the Taken Blights summons Xir-Kuur, Not-Taken, a Hive Knight, with Void-shielded Taken Acolytes. After a third of its health is gone, the Taken form takes over. Killing the Not-Taken form merges the two into a colossal form that the player cannot defeat. Sealing it in the room requires standing on the plate in front of the door. Sources differ on the phase order and some details.