The battle system, called Command Synergy Battle in game, has been described as "More tactical than Final Fantasy X, faster than X-2, and almost as seamless as XII". The enemies are visible in the field. When the player runs into them with the playable characters, the camera changes position and the battle menu pops up, marking the start of a battle. This makes the transition from exploration to battle nearly seamless.
In the battle, the player can control only one character out of a party of up to three, but that character can be switched anytime. The other party members act according to A.I.-settings. The Active Time Battle bar returns in the battle system, but this time it is divided into sections (different screenshots show three and five sections). Each command available to the battle party have a numeric value referred to as "ATB Cost" next to the name indicating how many of these sections it will take up. This allows the player to input several commands per turn. The next turn comes up sooner if the ATB bar is only partially used.
The available commands vary from character to character, but series staples such as Attack, Fire, Blizzard and Cure make a return, along with new commands such as Launch, which will send the enemy flying into the air. The system how a character learns these commands is not yet revealed.
Magic is only available to characters that are l'Cie. Because of the "ATB Cost" points, there is no MP in the game. Also, since magic cannot be used outside of battle, the party's HP is completely restored after every battle.
A new element called the Break bar is added to the battle, as well. It is specific to each enemy, and it depletes as the player performs attack combos marked by a percentage. If the combos continue, "Break Mode" is entered, where even more damage can done. Enemies in this mode can be Launched in the air and juggled while in Break Mode.
When a battle is won, a victory screen pops up, giving the player points referred to as "TP" and a one-to-five ranking on how they did in the battle, as well as showing how long the battle took and the number of chain and break attacks. This information is linked to the Trophy and Achievement systems of PlayStation 3 and Xbox 360, respectively.
[edit] The Summoned Summons return in this game as the Summoned, linked with the powers of the l'Cie. Revealed veteran summons include Shiva, Ifrit, Carbuncle and Siren, who all have a new, more futuristic design. The summons are used both in battle and as plot devices in cutscenes. According to an interview with one of the creators, Bahamut will also appear in Final Fantasy XIII.