Thread:Gsimenas/@comment-110.20.0.237-20150609131145/@comment-24451133-20150609163830

The "Multi Wielder" part is from the in game plot. Rain tells Kirito that she's not like him, a dual wielder, but a multi wielder. That's why, I suppose he placed that term there, but the skill itself, is in the Dual Wield skill list (and usable only when equipped with dual blades).