They give people a second chance to be born in a world they watch over. Only those who have died by an error, get this chance. What is this error? The Reincarnated hero creator does not even know. This creator only has one job and it is to reincarnate those sent them them, whether it be an animal or a human. that also make sure the reincarnated can not die. If they manage to be killed, they are simply reborn again in another random place in the same body they were killed in.