I vaguely know who you are talking about because he popped up in P4 as well.  He told the group about Izanagi and Izamami if I remember how to spell their names right.  How Izanagi lost his wife and he went to the underworld to get her back, but found out she had become a rotted corpse of her former self.  So, trying to hide his shame from her unsuccessfully, she cursed him and his creations, swearing to kill a thousand men a day.  He swore in turn to create 1,500 a day to make up for the loss.