Will Power - yes. This is its effect: Ignore all debuffs that are on you this cycle (meaning you receive no effects of them). The player can still receive new dubuffs, but they will have no effect whilst Willpower is active.
Can you verify when Chimaera casts Triple Slash it deals damage even though 1 cast misses ? Just let me know when it happens again.
Right after open beta release we will focus on fixing bugs. Then, after, or maybe also simultaneously, we will start on Bosses :) Thanks for all the feedback. We are aware of all the issues and are working on them.