Iai Strike (居合い斬り), also known as Iai Blow and Iainuki, 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. The job class Samurai are most often associated with the technique.
Iainuki is the Level 5 ability of the Samurai. It has a chance to instantly kill all enemies.
Iai Strike is the Japanese name of one of Sephiroth's Brave attacks. It is called Sudden Cruelty in the English release. It is also an ability connected to the Smiting Soul accessory. This Iai Strike gives the user a 2% chance to inflict an instant Break on the opponent whenever they damage the opponent's Brave.
Iainuki is the ability of the Samurai card in the Duel Colosseum. When used, the Samurai card discards all Chaos and Boss cards in the hand.
Iai Strike in Final Fantasy IX.
Sudden Cruelty in Dissidia Final Fantasy.
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