Being cast down from Heaven, all because Lucifer had different ideas. Lilith leaving him, Heaven having hurt Charlie, he's had enough of it all.

Lucifer his face darkened. He's never killed anyone. Thus why is he the one being sent down to Hell? So, if Heaven wants a monster, they'll get one. Lucifer spread his wings, his horns grew out of his head. His demon tail showed as he looked up at the sky.

"Then I'll become the Monster!"

He spoke, with a sinister smile, fire spreading all around him.