Iainuki

Iai Strike (居合い斬り), also known as Iai Blow, is a recurring Command Ability in the Final Fantasy series, and has also appeared as an enemy attack. It typically attempts to instantly dispatch the target.

Final Fantasy V
Iainuki is the Level 5 ability of the Samurai. It has a chance to instantly kill all enemies.

Final Fantasy VII
Iai Blow is an enemy ability used by Forbidden when it has less than 85% of its HP remaining. It does physical damage and has a chance to instantly kill the target.

Final Fantasy IX
Iai Strike is a Sword Arts for Steiner. It attempts to instantly kill an enemy.

Final Fantasy Tactics A2: Grimoire of the Rift
- Iai Blow is an ability usable by the Parivir class. It attacks a target for damage equal to half a normal attack and has a chance to kill them instantly.

Dissidia Final Fantasy
Iai Strike is one of Sephiroth's Brave attacks.