Sword of Blood

One of the four 'Coffin Knights'

The four knights released from the coffins that Pazuzu attempted to keep hidden throughout Aegis of Uruk. Without Pazuzu, they have awakened and now roam the Tower without a master, attacking various climbers as they see fit. Gremica reveals that they are magical machines, created from the Dark Armour formerly used by the Sumar Empire (Red Knight, Blue Knight, Mirror Knight, and Hyper Knight) and their individual characteristics likely carried over. Henaro's motivation for climbing the tower is to recover the four knights by the orders of Amina and protect the king's shadow.

(Source: Wikipedia)