[Senna]

Nah, it gotta have an inflict check. Combine this with the right shell (Cel to reduce movement), parting shot and Mirage walk and you pretty much screw over the entire duelist class (Except ghost) and a few others (Like Boxer and so on). It'll only start a new problem if it doesn't have an inflict check. Unless there will be some immunity after a bit.

Else it'll just be a sonic shell silence for dashing skills. I quick-draw dual with it, I crit you, you can't use half/almost all your skills. This goes on for the entire fight, I win.

The cheese on this will be godly without the check/immunity.

[Fern]

Would the bonus damage ignore armor, out of curiosity? I think that's a good proposition though.