Rune Backup Trooper Parajan:
You're a livesaver. All right, go find Krogel in the Land of Chaos, and kill him.
You can't completely kill off a demon of his ranking, but it will certainly cut the numbers of monsters created from corpses.
As proof of his defeat, bring me 2 Chunks of a Corpse.
Give the chunks to Investigator Quincy for analysis. She might find a way to eliminate Krogel for good.