You are born today on the red moon right on the throne where the demon lord used to be, surrounded by several other demons chanting and saying prayers towards you

"O lord Azzazel, Come back unto this world and make our spite and greed much higher than before"

You yourself however are totally conscious yet you dont remember being a demon lord at all, usually when demon lords are born the memories and knowledge of past lords are passed onto the new demon lord, but you don't remember anything like that, you just lay down there on the throne as a fully conscious demon child while the other demons are chanting and praying for you