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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Kingdom Hearts. Kurt Zisa. Pretty much the hardest boss ever, and that doesn't change just because the thread was necrobumped.