We've probably all had a boss in a game that felt impossible, but what about those bosses that were so well hidden and difficult at the some times, you sometimes didn't even believe it could be real until it kicked your ass a dozen times in a row?
Soul Calibur III's Night Terror was that boss for me, what about you guys? You don't have to watch all the video, but i did just to reminisce on the enemy's power back then.
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I'm just glad I don't have to say Bonetail from Paper Mario: Thousand Year Door. Killed that bastard on my first try. [I]Getting[/I] to him was a pain in the ass, of course.