Verethragna

Kaidou Nobunaga (ノブナガカイドウ Nobunaga Kaidou) also know by the alternative name Verethragna or his title Undead King (アンデッドキング Andeddo Kingu) is a wandering mage that lived during the time of Zeref and participated in the End War as a freelance mercenary. During that time, he summoned Solomon the Undead King and received his blessing, becoming an undead. Eventually, the full repercussions of what he has become turned his dream into a nightmare, but before he could do anything he was sealed away by a long lost holy order who viewed him an abomination that could not be killed, but could be allowed to roam free either. More than 400 years later he was unsealed and though wondering who could have done, he primarily wanders the lands, searching for a way to get rid of what he has become.