Lifesiphon (エンドアスピル, Endo Asupiru?, lit. End Aspir) is a recurring ability in the series. It is associated with Command Synergy Battle where it is an auto-ability which recovers an ATB gauge segment when defeating an enemy.
Lifesiphon is a Commando auto-ability which instantly recovers one ATB gauge when defeating a foe. It can be learned by Lightning at Crystarium Level 1, Fang at Level 6, Hope at Level 7, and Sazh at Level 8.
Lifesiphon is a Commando auto-ability retaining its ability to recover an ATB gauge segment when defeating an enemy. It can be learned by Noel at Role Level 28, Cactuaroni at level 7, Chocobo at level 13, Dragoon at level 10, Frag Leech at level 18, Golden Chocobo at level 9, Gorgonopsid at level 41, Lucidon at level 99, Meonekton at level 18, Munchkin at level 9, Red Chocobo at level 33, Scutari at level 4, Seeping Brie at level 34, Thermadon at level 3, Twilight Odin at level 41, Vespid Soldier at level 31, and Vouivre at level 8, and is known by default by Chunerpeton. It can be infused into other monsters.