Demon king gremory

Description
He is a demon king who is ranked 56 th out of 72 demon kings. He was the holder of the Unique Skill, {Primal Conjurer}, which allowed him to call upon two powerful primal spirits of the same level as himself. His presence alone was the equivalent of three beings of the same rank, and he was terribly powerful.

In chapter 98, it was shown that he had struck a deal with the crown prince months ago for the preservation of his home in return he asked crown prince to poison his father.

Later ,it was revealed that it was one of the tricks played by Demon king Gremory as he enjoyed seeing the despair, hopelessness and humiliated faces of the people.

In chapter 110, he fights Roark Belmont, defeats him and tried to kill him before he was interrupted by Noah.

In chapter 116, he is killed by Noah