Talk:Magic Gems/@comment-24.57.178.85-20181205010332/@comment-10429980-20181205021122

I think you've misunderstood why monsters can't give birth to incubi. It doesn't have anything to do with the energy they are fed during pregnancy or the sperm not entering the egg. It has to do with the fundamental "setting" of reality that their universe is currently under. Namely "monsters are superior to humans" translates to "monsters cannot give birth to humans/inferior beings," and thus monsters only give birth to monsters. And since all monsters are female, all monsters give birth to monster girls.

Albeit there is one exception, namely if a human woman has already conceived a male fetus when she is monsterized. In that case she will carry the boy to term and give birth to a baby incubus. So it could be said the way this rule works is more specifically "monsters cannot conceive humans, but they can give birth to them."

One of the main goals of Lilith increasing her power is to remove/break/bend the "monsters are superior" aspect of the setting, and thus allow incubi (who are meant to be the male counterparts of monsters/the new humanity) to be conceived by monster girls.

Also, magic gems are made of a specific type of special ore that is mined in mamono realms (one of a number of special ores found in them). I don't think you can just craft them from minerals the bodies of monsters and humans produce. They're probably quite different minerals.