A world where sentient beings can't die. Rather than a revive book, some are searching for the key to permanent death. Everyone is cursed with immortality. No one knows how long it has been. Wars are pointlessly brought about because there is so little meaning to everything. Characters can still die, though for a random amount of time. They always come back eventually. World is under a black sky with a color-changing sun (moon?). The sky is black regardless of daytime or nighttime. 