Summoning an Eidolon is a technique.
Techniques, known as TP Abilities in the Japanese version, are command abilities in Final Fantasy XIII used by expending Technical Points. Characters learn Techniques by advancing their Crystarium, although the abilities' placement in the characters' trees varies depending on the characters' main roles; Techniques are always located somewhere in the one of the character's three main roles. Only the party leader can use Techniques at the player's command. Using a Technique doesn't expend the ATB gauge and is therefore like a free turn.
Techniques
Dispelga
Dispelga removes all buffs and debuffs from both enemies and allies at the cost of 1 TP. It is learned at Crystarium Stage 8. Lightning learns it in the Commando role, Snow and Fang learn it in the Sentinel, and Sazh, Vanille, and Hope learn it in the Ravager role.
Libra
Libra is the first TP ability the characters learn, available at Crystarium Stage 1. Libra reveals the enemy's information screen at the cost of 1 TP, though it must be cast multiple times if the player wishes to gain every single piece of information on the enemy. The item Librascope does the same to all enemies and reveals all information at once. The player is rewarded with the Trophy/Achievement Loremaster upon fully revealing 100 enemies' info.
Lightning and Sazh learn Libra in the Ravager role, Snow in the Sentinel, Vanille in the Medic, Hope in the Synergist, and Fang in the Commando role.
Renew
Renew is learned at Crystarium Stage 6 for everyone but Lightning, who learns it at Stage 4. Renew revives all KOed party members and restores the party's HP half of their maximum for the cost of 2 TP. Lightning, Vanille and Hope learn it in the Medic role, Snow and Fang in the Sentinel, and Sazh in the Ravager role.
Summon
The Summon command costs 3 TP and is learned automatically when a character acquires his or her Eidolon. When used, it dismisses the other two characters and summons the character's Eidolon on the battlefield to fight alongside the summoner. In Gestalt Mode the summoner and the Eidolon join their forces and the player can command the Eidolon with button commands. After being dismissed by unleashing the Eidolon's special attack, the party comes back in full health, all previously KOed characters revived, and all status effects healed.
Quake
Quake is learned at varying Crystarium Stages. It deals Earth-elemental damage to all enemy targets, and misses flying opponents. It is the only means of inflicting Earth damage the party can use. Lightning learns it in the Commando role at Stage 5, Snow in the Sentinel at Stage 5, Sazh in the Commando at Stage 2, Vanille in the Saboteur at Stage 2, Hope in the Ravager at Stage 3, and Fang in the Sentinel role at Stage 5.
Stopga
Stopga costs 1 TP to use, and resets all allies' and enemies' ATB gauges while canceling all actions in use. It is learned on Stage 9. Lighting and Vanille learn it in the Medic Role, Snow learns it in the Ravager, Sazh and Hope learn it in the Synergist, and Fang learns it in the Saboteur Role.
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