If you play a sorceror, which I daresay not, when you get to the final challenge, one word: Guardian.
One would think that the Lord of Hell would be immune to fire. Perhaps its a bug with Guardians (they might be normal magic, not fire magic), but summon about 10 of them and they'll wipe out anything. I was having second guesses about whether Diablo would kill me or not, and while I'm picking off littler monsters, the screen scrolls over to him spitting blood out of his chest. Hm!
