Zantetsuken

Zantetsuken (ザンテツケン) is an ability which appears in Kingdom Hearts Final Mix, Kingdom Hearts: Chain of Memories, Kingdom Hearts II Final Mix, and Kingdom Hearts Birth by Sleep. It consists of holding the Keyblade tip-backwards, then performing a single powerful slash through the opponent's body so quickly that the cut doesn't appear until after the technique is finished. It is usually a ground combo finisher, and can defeat minor enemies in a single hit. In Kingdom Hearts Final Mix it requires 2 AP to equip, while in Kingdom Hearts II Final Mix it is only available while using Limit Form, but when executed it instantly removes one Drive Bar. In Kingdom Hearts: Chain of Memories, the damage it inflicts is sharply reduced, and instead it is able to break the opponent's card and render it unreloadable.

Kingdom Hearts Final Mix

 * Sora learns "Zantetsuken" after defeating the Kurt Zisa.

Kingdom Hearts: Chain of Memories

 * Sora learns "Zantetsuken" starting at level 22. The move will destroy the oppoent's card and make it unreloadable for the rest of the battle.

Kingdom Hearts Re:Chain of Memories

 * Sora learns "Zantetsuken" starting at level 27.

Kingdom Hearts II Final Mix

 * Limit Form has "Zantetsuken" as a default ability.

Kingdom Hearts Birth by Sleep

 * Terra has Zantetsuken as a Deck Command, obtained by Melding the commands Stopga and Dark Haze or Sonic Rave. This attack will take a few seconds to charge. After this, charge Terra will stride forward and slash the enemy. If the enemy is not a boss Zantetsuken will have a chance to destroy the enemy straight away, if the enemy is still not destroyed it will still take damage according to Terra's strength. Zantetsuken can be leveled up to level 5 and takes up 1 slot.

Kingdom Hearts 358/2 Days
While wielding the Oathkeeper, Two Become One, or Dream Sword, the ground combo finisher is a Zantetsuken-like slash.

Etymology
In the Final Fantasy series, "Zantetsuken" (斬鉄剣) is the signature technique of the summon Odin. It typically inflicts Instant Death upon all enemies.

Zantetsuken