She refuses to say happened or what caused it. But she hates humans to an extreme. Having lost her right arm, she uses and fights using her left arm only. She says she obtained her Honedge, Asura, when hearing it saying it would give her the power. She is aware of it slowly draining her life energy, but accepts it as long as she gets the power she wants to get the revenge she so strongly desires.

Yes I know the image is wrong but I cant left and right so leave me alone and the image wont change when I try to replace it but it wont so BLARGG