There's nothing but the head and a piece of the chest left of the dude, yet he's in no distress. A tough opponent. The detached hand was even holding the staff, so if I had to guess, he left behind no loot, either. However, if you jump back to chapter 32, Nefaques is actually a cardinal, a big honcho, so he ought to have a residence, workplace, and such, which can now be raided at leisure, with nobody able to object since Nefaques turned out to be a void monster. Not that I'd expect a shounen series to pay any attention to such details. I'd suppose absolutely nothing will happen until the MC's gang needs to fight him again in the future.