I notice that it would go on with stopping Morghante and in Celestia they didn't pay much attention to the floating land. So the world would be a larger part of the floating land.
Story: A large part of the floating land far away from Celestia is attacked by Morghante's army. The Water-mole leader is dethroned by Moghante. She uses her dark magic to turn half the Water-mole people against the Water-mole leader's army. Merle Ambrose does not know what is going on there and sends you to check on the Water-mole leader them both being good friends. After you arrive you find out what happened and tell Headmaster Ambrose. He sends you to help them out. The last boss would be Morghante with the Star, Moon, and Sun powers absorbed.