The top of the castle that houses the Dark Emperor. The King (Your Mii in the original game) is held in a hanging cage, waiting to be freed by noble fighters.
The Dark Emperor himself inflicts certain effects on the fighters depending on their color. For instance, red characters get a power increase. The stage itself has one large platform to the left and a smaller raised platform to the right. Either of these platforms can break. If you attack the cage with the Mii in it, the Dark Emperor will go away.
Text by RorschachsDiary1