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

After hearing what Mephisto said, Roy was speechless and couldn't help complaining, "Mephisto, is your brain damaged? Since you've already seen the scene of Lilith killing the seven demon kings, why do you still want to attack Sanctuary? Have you ever thought that it might be because of your actions against Sanctuary that you will attract Lilith's revenge?"

"No, no, no, Osiris!" Mephisto shook his finger at Roy. "You might be mistaken about one thing. Lilith isn't going to take revenge on us because we attacked Sanctuary. In fact, whether we let Sanctuary go or not, Lilith will take revenge on us! Don't forget that she's a traitor of the Burning Hells!"

With Mephisto's reminder, Roy suddenly realized that Lilith was a traitor among the demons.

Inarius