Board Thread:Questions and Answers/@comment-83.204.115.97-20170416220442/@comment-27033694-20170417203934

They can but why would they? There aren't any NPC who is in love with someone (except Albedo). Also a heteromorph can make offspring only with another heteromorph. Breeding between het. and demihumans or humans are not possible. And I belive all undeads are infertile even if they have the "necessary organs".

Increasing the power of Nazarick? Doesn't needed. The residents of the new world are all weaklings.