Board Thread:Questions and Answers/@comment-173.126.253.174-20140207204011/@comment-1173941-20140207205233

We know there are 10 Unique skills total (meaning we haven't seen 8)

While pointless to the story, the author has revealed the names of 4. Darkness Blade, Battoujutsu, Shurikenjutsu, and Infinity Spear. But he never said what any of them did.