Carnage: Spectacle of an abandoned hero
Regulus was once hailed as one of the heroes of humanity, tasked with stopping the rise of demons, yet he found himself dead at the hands of his squad.
They sacrificed him for fame and power to the Demon God Kafka, only for the god to offer him a contract after his death, which he accepts.
Reborn years later, his betrayers are now worshipped as gods on earth, leading their own societies, marking the past him as the spawn of the devil, which had to be exterminated.
Now he vows to take them down, to destroy what they sacrificed him for.
Not in the body of Regulus, but as Carnage Beelzebub, son of one of the seven demon dukes of kafka, yet if they find out it is not the real Carnage, his revenge would be over.