Board Thread:General Discussion/@comment-7623482-20160512154625/@comment-27045866-20190922181835

"Despite the distinction drawn between them, “heroes” and “incubi” are virtually the same kind of beings. The only difference is whether the limit was removed at the hands of a god or a monster. They're “heroes” because they fight with the chief god's blessing, and they're “incubi” because they're monsters' husbands. They can be differentiated in such fashion by where their allegiances lie, but no matter what method of biological classification is used, it is impossible to draw a clear distinction between the two. "

"Additionally, if they were to take divine mana within their body by acquiring hieromancy, or take mamono mana within their body by obtaining a monster wife, then there would probably no longer be any way of distinguishing them from heroes or incubi.

In this way, the boundary between “humans”, “heroes”, “incubi”, and “beings who transcended human limitations” themselves is extremely vague. Biologically and magicologically, they're nothing but “strong humans” who just took different paths to get there. It is difficult to accurately classify them, and ultimately, the current classification is done out of convenience to reflect their origins and allegiances."

World Guide III