I'm sorry, but folks who say "i want a story where the villain wins" come off as corny. I'm not saying the concept can't be well executed, but often, the request comes from those who project heavily onto the villain and just don't want to see them receive consequences.
imagine a swapped version… this immortal who despite everything they've seen, still sees the world as beautiful, and teaches the mortal that to give them hope to keep going in life