This is the last unlockable level in Patapon 2.
You fight Zuttankarmen in this mission, which is a variation of Dettankarmen.
It has new attacks that Dettankarmen also learns as it levels up. See "Zuttankarmen"
When defeated, it drops Lv.1 egg of Zuttankarmen Fight.
Zuttankarmen is easily one of the toughest boss in the game.
You can get this mission after you beat The Great Cursed Dettankarmen. Dettankarmen will drop Grey Rainbow and unlocks mission "Grey Rainbow and The Other Face". In that mission you will fight Zuttankarmen.