Who'd win in a one on one fight?
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Even if the Undead died, he would spawn at the nearest bonfire and come back. He also has a wide, [i]wide[/i] variety of tools at his disposal: sorceries, pyromancies, miracles, hexes, all kinds of weapons... not to mention that some of the aforementioned things are stupidly powerful. Wrath of the Gods (DS1), Climax, Affinity (DS2), Soul Stream, Crystal Soulmass, etc.