Talk:Sword Art Online/@comment-118.100.213.30-20120729053049/@comment-5308133-20120729121550

there are differences between unique,extra and outer skills..

about uniques..right now I think we know of only 2..dual and holy sword.

extra skills are skills that are developed from the skill tree or learned from npc's

such as tracking will unlock night vision..

npc's such as martial arts and meditation.

Outer is one own creativity to create own skills..

example of such skills are weapon break..