"Zero from the Ice Plane? Aso came as well? Oh my, such a grand gathering. An allied army from all the Undead Planes, and the Undead Emperors are personally leading?"
Corpse, Ice, Desecration, Blood, and Darkness were five of the six major Undead Planes already known to have designs on the Mortal Plane. Rex's superior—or I should say his superior's superior's superior—was the Ice Plane's Undead Emperor, Zero.
The Undead Emperor Zero's true name had long been forgotten by the sands of time. He was a SemiGod-rank lich who gained fame approximately 1500 years ago. Nothing was known about him before this, and it didn't seem like he was actually from the Ice Plane. He possessed a vast amount of combat experience and counted as a "newcomer" among all the Undead Emperors.
