"This all happened millenia ago, and I haven't really asked about it in a while, but they sometimes ended up with mild angelic powers paired with, mm, mental health issues. Most of them were okay, I think, but it was apparently Really Not Fun to be one of the unlucky ones and Not Entirely Safe to be in their vicinity.
...My kind of angel don't biologically reproduce with each other, it occurs to me that that might be non-obvious."