Double Traversal: from the Border Baron to the God of Light and Reincarnation

The protagonist travels from the animal soul of the 996 Society to the body of a down-and-out baron on the frontier. When he is about to die, he activates the treasured Chaos Stone, unlocks the Earth-to-other world double-travel and the Chaos Castle system, and uses modern materials and Chaos troops to gain a foothold and develop rapidly...