User blog comment:Caporai/Kasumi, the Mistwalker/@comment-7709681-20131001160809/@comment-3286233-20131001163029

Her ult also robs enemies vision and gives them Mark of the Mist. While it doesn't do any damage, her other skills gets improved. I also wanted her Mist Slash to slice all the targets within the mist, but I guess it will deal too much damage.