A Chopperite is a Fallen in Oninaki.
Small, humanoid Fallen that travel in packs and detach their cranial husks to wield as weapons. Their weapons are poisoned, so make sure you stay out of their reach during battle.
A Daemon's Testimony 1-3
Using weapons is one thing, but poison? That's another entirely. It makes me think they must be intelligent after all. How do they fashion those weapons in the first place? I can't stop thinking about it, but that only proves this research is worthwhile.