"That's not too dissimilar to mana, honestly," Zetta said thoughtfully. It was like being an Overlord and drawing on the power of the world's denizens. Not something commonly done, but he'd heard rumors of that pretender Zenon doing something like that... "But you don't seem to internalize it. Reincarnation's not so different either -- we demons can do that if the Dark Council of the Netherworld agrees and we have sufficient mana power."