Devan became a wandering soul after losing Lee to old age. He went from place to place, growing stronger every day. Unlike how the world was in the present day, back then, there was no such thing as a system. Strength was based on your own capabilities and had nothing to do with how high one's level was. But as Devan was a mix of both Demon and Nephilim, he was naturally strong from birth.
He spent his days trying to fill the empty hole that was left behind after Lee had passed. After a few thousand years, Devan finally found himself on the Pleqoth continent. It was then that he ran into his first undead, a young girl around ten years of age that had died of an illness. Their meeting was a strange one and one that would be the start of Devan's new path in life.