Dark Old Demon

Roy's life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
...
It's really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

Custom Made Demon King

"Lilith? The first succubus?" Roy pondered and asked, "Apart from her, are there any other demon kings in this world?"

"No!" Julia shook her head. "In this world, only His Majesty Samael and Mother Lilith are leading."

"Then, let me reject your proposal!" Roy said expressionlessly. "I won't go with you to find Lilith to rescue Samael!"

"W-why?!" Julia immediately became anxious. "After finding Mother Lilith, she can handle it. We only need to tell her the news, and we won't need to do anything. Why are you unwilling?"

"That's not what I mean!" Roy shook his head. "Julia, think about it carefully. The Destroyer's aura of depravation means that a demon must have tempted and transformed him. Is an ordinary demon capable of doing that to such a powerful force like the Destroyer?"

Julia was stunned. "You… You mean…?"

Chaos Power?