Solve my dilemma

Gr8TonyStark

I am in act5 and have a rank4 4*corvus.
Shall I use him as he runs out of his charges sooner than I expected .
Also give me some tips.

SplamBorgin

Yes you can use him. But you need to maximize his effectiveness for good results.

You can maximize damage and minimize charges used by performing this cycle: Medium-Light-Medium, Parry, Medium-Light-Medium, Parry... keep going until SP2 and make sure you drop SP2 while you have atleast one charge. This way you can get beyond 35 combo. Once you're out of charges, perform 5 hit combo-parry cycle. [BEWARE you are coldsnap immune only as long as you have charges]
Try and collect as many Persistent Charges as possible. They boost his crit damage by a lot.