The Final Apostle's Journey

A man who betrayed his companions is trapped in a loop, forced to fight again and again. After who knows how many billions of cycles, he finally escapes by sacrificing his right hand, only to find that the outside world has changed beyond recognition. As cultivation collides with technology, the gods rescue him and fit him with a prosthetic. Holding his wife's soul hostage, they force him to hunt down the other apostles.