I'm just here to inform you about Darkness Blade, one of the few canon Unique Skills that has emerged on this fanon. There's no urgent matter, since I have found a loophole in the system that could allow for more than two Unique Skill descriptions while using one page (tabbers).
However, according to some AnimeExpo 2014 goers, the «Darkness Blade» was given to the player with the highest PK count. The only proof I have of this is a forum reply very studious SAO Wiki editor, Gsimenas. This is his reply regarding the Darkness Blade requisite.
Again, this change is not urgent to take your time. I know, for the last time you were here, you informed FedeTkd that you were going through a very busy part of your life. I wish you the best.