Isekai no Senshi toshite Kuni ni Manekareta kedo, Kotowatte Heishi kara Hajimeru Koto ni Shita - Vol. 6 Ch. 23

[MangaDex]

 

[Oberon-056]

They were not kidding when they said that guy was "the whole circus" in the last chapter.

That being said, this may have been the Origin of Orcs in this story: A "Hero" who became corrupted, and lost their sense of self.

Bultcrest is likely from the bloodline of said former hero, and the "Werewolf transformation" was originally the power of said Hero.