Spoiler alert, I guess. You know, after a few millennia it's just called Rakis, and then a while later it gets glassed by the super-whores.

Spoiler alerts! Also, it's all Duncan; Pauls jihad as a fart in the wind, the God emperor explodes into a school of fish, but Duncan is forever. He outlasts all and jukes into a different universe. This universe? Absolutely fucked, everyone a zombie.