Mummy

From publisher blurb:

You are an Ancient Egyptian, who has been blessed by the god Horus with immortality. Though you can be killed, this only sends you into a cycle of death and resurrection. You have been serving your gods in this cycle, oscillating between the land of the living and the land of the dead, for hundreds of years. You have recently spent a long stretch in the land of the dead, but it is time to return to your body once more, and serve your ancient gods in the modern world.