The strangest thing about him is the idea that his form isn’t that important. The sheath is like a binding for him, keeping his power contained. So drawing him out isn’t like drawing a regular weapon, but rather an unleashing of a creature who has been kept chained.

Once that creature is unleashed, he becomes a weapon—even if he’s unleashed only a little bit. The sheath itself turns into a weapon, twisting those around it. You don’t need to stab someone with Nightblood to kill them; smashing them on the back with the sheath works just as well. It will crunch bones, but beyond that, merely touching them with the sheath when the smoke is leaking can be deadly.