"Notice the bosses you're fighting are above your level" (just like how a new player as level 1 would try to land attacks on a boss as an example : Shivercowl. Of course they gone miss they barely have any high abilities compare to that bosses abilities.
Now look at it like this... you are the noob once again, and what do new players have to do to land more of their skill attacks and dagger attacks ? to do damages towards a boss with a bonus of over 3-4 or 5 stars above their heads meaning for stronger groups. Best way I could give you advise man is to find them rings. (The most Powerful Cunning Rings, & Dagger Rings)
![Wink ;)](./images/smilies/icon_e_wink.gif)
Yes bosses defense is too high, I know.. (Just was saying smoke bomb and maybe these rings would help)