What's the best optional superboss in a game?

What's the best optional superboss in a game?

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ozma

daughter of the cosmos

yiazmat

While not particularly difficult, figuring Sephiroth in Kingdom Hearts was always really cool.

any boss that is seemingly undefeatable

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Lord British

What's the point of optional bosses anyway? Make them mandatory or fuck off desu.

Kingdom Hearts 2 in general

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Why are people so afraid of geese? They're aggressive but you can beat the shit out of one easily.