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Traitor... you will pay!
- —Sephiroth uses Octaslash in Crisis Core
Octaslash (八刀一閃, Hattō Issen?, lit. Eight Blades in One Flash) is one of Sephiroth's trademark attacks. It consists of a swift sequence of sword slashes, though despite the name it is not always comprised of eight hits.
- See also: Digital Mind Wave/Videos#Octaslash
Octaslash is a Digital Mind Wave usable by Zack when Sephiroth's portrait is lined up. It is known at the start of the game and consists of eight sword attacks against a single target, the power of each sword slash depending on the level as follows:
|Level 1||Level 2||Level 3||Level 4||Level 5|
The animation is different from the DMW attack: Sephiroth charges Zack, uses the Masamune to fling him into the air, then leaps up, attacks several times and dives back down to the ground to strike again, Zack falling to the ground after he lands. Unlike Zack's version of the attack which deals eight separate hits, Sephiroth's Octaslash only hits five times, four of which Zack blocks, and the damage is dealt as a lump sum.
In the revised battle between Cloud and Sephiroth, Sephiroth uses an attack similar to Octaslash at the climax of the fight. Sephiroth reveals his lone wing and flings Cloud into the air. He flies after him, stabbing him eight times before throwing him back to the ground. The way Sephiroth uses this attack, is strikingly similar to when he used it against Zack in Crisis Core.
Octaslash is one of Sephiroth's HP attacks. Sephiroth charges forward while swinging five times, turning in the air to track opponents. He is able to use it on the ground initially and learns to use it in the air at level 13. It costs 40 CP to equip and 300 AP to master. Though the animation depicts Sephiroth slashing five times, the attack does indeed hit eight times as per its name, dealing seven hits of Bravery damage before inflicting HP damage as the eighth hit.
Octaslash returns in the prequel to Dissidia as one of Sephiroth's HP attacks, with greater tracking and range. It now costs 30 CP to equip and 130 AP to master.
Octaslash appears as a strength ability in Final Fantasy Airborne Brigade. In order to obtain Octaslash, the player must perform transmutation on the Oblivion ability. In addition, Sephiroth also uses Octaslash when summoned into battle.
Octaslash is named as a counterpart to Cloud's Omnislash. While Omni means "all" signifying it hits all targets, "Octa" means "eight", as it hits eight times.
- In Kingdom Hearts II, Sephiroth's main attack when fought is a sequence of swift sword attacks similar to Octaslash, consisting of approximately 7-8 hits. Though the attack resembles Octaslash, Kingdom Hearts II predates Crisis Core, where the attack first appeared and was named, and the name Octaslash has never been officially used to refer to Sephiroth's attack in the game.