Comment who you think is the most difficult boss in any game you've ever faced and why. Mine is a tie between Dark Gaea from Sonic Unleashed or Sigma from Mega Man X, because both have multiple stages and are unbalanced as shit.
[spoiler] I will not be surprised if I get a lot of Sonic bosses from this. Or Dark Souls. Or any notorious series for that matter. [/spoiler]
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Demis from Skyward sword