Boost target's odds of interrupting actions and avoiding interruption of own.
Vigilance is a Synergist command ability expends 2 ATB gauge segments. Sazh learns it at Crystarium Stage 2, Snow at Crystarium Stage 7, Vanille at Crystarium Stage 1 and Lightning at Crystarium Stage 10.
Vigilance returns in the sequel as a Synergist retaining it 2 ATB gauge segment cost. It has an area-of-effect spell variation known as Vigilaga. Vigilance can be infused into other Synergist monsters.
Vigilance, also known as Caution, is a reaction ability in Final Fantasy Tactics. The Thief class learns it for 200 JP. Receiving an enemy's attack causes the character to take up a defensive position that doubles the unit's evasion rate (but not reduce damage received). It lasts until the character's next AT.