you have to wait until your high rank ,or,you can attack as a big group! that's how i did it. !
;-)
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I recommend you use healer or maybe rouge, or maybe bring some friends.
(this is real not a prank) go to the dark area and count 10 times then go to the right then you got through!
you fight him you work hard for it that's all you do.
I think you have to beat the game and it will be there in the minigame section
Oh cmon its easy, all you have to do is keep trying, youll beat some time or another.