[@shagranoz] Aw dayum, between crushing its body and severing its head I thought for sure that Osiris might have destroyed its void. Or is the issue that a void is a negative space that gets bigger as it takes damage? I hope Coffin Fortress brought some concrete fill for this one. 

Anyway, I didn't really narrate the monster dying, since I feel it's the GMs job to decide that to prevent power gaming and stuff. I was more narrating Osiris's certainty that this thing wasn't going to be alive much longer.