Skies of Arcadia/Captain Moves

Captain Moves
Once Vyse gets command of The Delphinus, you'll get the option to use Captain Moves during Melee Battles.

While Captain Moves are extremely powerful and useful, they require your party's entire reservoir of Spirit Points to execute. However, they are extremely useful against bosses, most of whom won't stand up to repeated use of the Captain Moves.

Prophecy
Vyse's party join together and crash a Moon into the battle arena, causing massive damage to all enemies. This move requires that all four members of your party are able to act; status effects like Sleep or Stone will prevent you choosing this action.

Blue Rogues
All active crew members of The Delphinus perform an action to either damage the enemy or heal your party. While Prophecy is more powerful, the benefits of Blue Rogues can be more useful in a prolonged battle if your ship is well-crewed, and can be executed even if a party member is temporarily out of commission due to a status ailment like Sleep or Stone.