Right now, there were two potential causes as to the situation with Richard's corpse.
One was that the Boss Monster caused it.
'If the Boss is a Necromancer, then it only makes sense that they could do something like this.'
Monsters weren't usually very intelligent, but there were exceptions. Plus, since the entire setup of the Dungeon was so special and resembled the kind that housed intelligent life, the possibility couldn't be discounted.
But, Rey couldn't see a Boss Monster around, which meant this was probably not the Boss Room. If the Boss really was behind this, it wouldn't just leave the corpse lying around.
'That leaves me with the second option.' Rey stood to his feet as his eyes narrowed as a gleam of anger flashed inside.
'Adrien Chase!'
Adrien was a necromancer, and since his involvement in this entire Grand Calamity Class Dungeon Conquest was pretty much a certainty, he was a more prime suspect.