Hellfire I think, I didn't try it on Diablo. Some quests are upgraded to bosses though. Monsters in the lower dungeons had 15-50 HP while the Butcher had a whacking 9200 HP. I think he's a big boss, for high levels with special loot.
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"Strange that you say that the Worldstone must be destroyed. The prophecies said nothing about that. Perhaps all we have fought for will be lost…" - Anya