Unique Skill

Unique Skills (ユニークスキル, Yunīku Sukiru?) are «Extra Skills» in «Sword Art Online» that are assigned to only a single player per skill. Like other Extra Skills, the prerequisites for receiving «Unique Skills» are unknown, but they are said to be given to players who fulfill a certain physical requirement. By the end of Sword Art Online, only four players were known to have Unique Skills: Heathcliff had «Holy Sword» Kirito had «Dual Blades» Ren had «Curse Blades» and Shuto had «Mult Wield Blades».