Octaslash is a Digital Mind Wave usable by Zack when Sephiroth's portrait lines 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: The Octaslash Independent Materia boosts the chance of Sephiroth appearing on DMW when equipped. It begins at 5x, and increases by 1x each level up to 9x. It is a level 8 materia bought from Research Dept. QMC+. A different version of the skill is used as an enemy ability. Octaslash is used by Sephiroth when fought as a boss in the Mt. Nibel reactor.