on and the condition for applying the action. For example, the target "Ally: HP < 70%" causes the character to target any ally whose hit points have fallen below 70%. The action is the command to be performed on the target. The priority determines which gambit to perform when multiple gambits are triggered. These heuristics guide the characters when acting autonomously, though player-directed commands are always given top priority. In Final Fantasy XII, a mysterious phenomenon known as "Mist" is the key energy which allows characters to cast summoning magic and perform "Quickenings". After defeating an Esper in combat, the player will be able to summon it to the battlefield. Similar to Final Fantasy X, the summoned creatures become active participants in battle, as opposed to the cinematic attacks seen in previous games in the series. Unlike Final Fantasy X, however, Espers follow hidden gambits, rather than the player's direct command. The summoner remains an active member in the fight, able to attack and cast support magic, instead of leaving the party or standing idle while the summoned creature fights. An Esper will leave the battle if either the summoner or itself is knocked out, its time limit expires, or it executes its special attack. Some Espers have origins in Final Fantasy Tactics and Final Fantasy Tactics Advance and others are derived from the final bosses of previous Final Fantasy games such as Chaos, the final boss of the first Final Fantasy, and Zeromus, the final boss of Final Fantasy IV. Final Fantasy XII introduces "Quickenings", a new Limit Break system unique compared to those in previous games in the series. Characters learn Quickenings by progressing to specific panels on the License Board. Each character can learn three Quickenings, which are unique to that character. Characters may string together Quickenings into large combo attacks, called Mist Chains, via timed button presses. If a Mist Chain reaches a certain length, a final strike will be initiated at the end of the Quickening cycle, called a Concurrence. Growth system As in many role-playing games (RPGs), characters "level up" each time they earn a set number of experience points from defeating enemies; each level gained increases the character's statistics and improves performance in battle. Statistics include hit points, the amount of damage a character can receive; strength, the power of the character's physical attacks; and magic, the potency of the character's magical spells.