Nephalem
Nephalem are, the most simplest term, abominations. They possess both grace and miasma, born of both heaven and hell, and their nature is both angelic and demonic. Yet, they are neither of the two. Some nephalem chose their angelic parents, some chose their demonic ones, but the majority chose to be neutral. And that caused many to fear them. For that neutrality alone is much more dangerous than any side.
Don't mess with Nephalem they're dangerous