Talk:Nero/@comment-30657860-20170419075705/@comment-33896168-20180620002006

Rather than say they can't mix, it would be more accurate to say dark and holy energy fuse together into a much stronger, but very unstable force. This would typically result in explosions, similar to a nuclear blast. But, there have been a number of cases were this didn't happen in the original trilogy. Black Alice tried to devour Ilias, and had, at least partially, mixed the two energies. and later on, Ilias also mixes the two. these two were extremely powerful at the time, and don't exactly help argue how a couple of babies could survive. on a smaller scale, Promestein's experiments were infusing angels with monster genes, which also mixed holy and dark energy. This typically resulted in mutations and mind shattering damage, so that's also a no go. However, this is all thinking of holy and dark energy alone. Humans could be drained by both angels and monsters without issue, meaning human life energy could be a perfect mix of the two and acted as a balance point, or more likely, its a third type of energy, capable of stabilizing the mix between the two. thus the mixed blood babies survived.

tldr; they survive thanks to mixed breeding.

p.s. mostly theory and guesswork. could be off by a mile.