There's a theory that Eris was the first bladedancer. She turned her own ghost into a knife to help her survive, and the arc energy that held it together turned it into an arc knife, and "The shaows [b]dance[/b] quickly among the dust. Make them your ally" is thought to be a reference to bladedancer invisibility, and that invisibility is the only reason she was able to survive while everybody else died. Also mask of the third man.