Lord of the Dead: Scourge of Ice and Fire

He comes from the Warhammer world and is the walking death. The most terrifying great necromancer in ancient warhammers tore apart the void during a forbidden experiment and fell into Westeros, a barbaric place where magic is weak and machinations are paramount. He discovered that the "magic" here was nothing more than children's tricks; the "war" here was simply playing house; and the "gods" here could not even answer the simplest prayer. So he smiled. The wind of death tore apart the knight's phalanx, the resurrection of the dead turned the battlefield into a factory of the undead, and the gaze into the abyss made the dragon wail and fall. From the mass graves of the Riverlands to the Red Keep of King's Landing, from the frozen ruins of the Wall to the Shadowlands of Asshai—— He feeds war with war, and the more he fights, the stronger he becomes. Every victory was a doubling of the army, every corpse a loyal soldier. Five Kings? Mother of Dragons? White Walkers? Gods? In front of him were just a group of souls waiting to be harvested.