He was an archangel and walked amongst the stones of fire, the thrones of god. Lucifer led a rebellion against God, he thought he was more beautiful than God, so he desired to be worshiped as God. 1/3rd of angels in heaven followed Lucifer's rebellion, then God cast out Lucifer, he fell like lightning from heaven.
This ended the preadamic race. God judged the preadamic world by catastrophic effects, this killed every living thing. God came down and inquired after the angels that caused the whole world to fall. We have ruins of a pre-existing world, fossils of people, but they were not human, dinosaurs, bones of vampires, hybrids, monsters strange creatures small and great died that day, that