Gluttony Cultivation: Starting with An Ancient Poison

Chad Sperling wakes up in the body of a man everyone around him has already written off, and he goes on being taken for that man. What comes with the body is the Gluttony Devouring System, which turns the cultivation world into things he can eat. He starts at the bottom of it, the spirit artifacts nobody wants, and works up through spirit veins and then the old laws themselves. Every one he swallows moves him a level, so he climbs without the practice the sects around him give their lives to. He eats his way through the lower realm and refines what he takes from it, and above that sits the source the whole cultivation world runs on.