If you don't have a bard running provo to compensate the stat loss from his debuf and curses, keep yourself a nice 100% reforged hatched with DI, max HML, 50 HSL and whatever else you can fit on it (maybe hit lower attack) and switch to it when he uses his -20 stat debuff.
When it is over, go back to your normal double axe.
Also, make use of the swords mastery if you can while hitting him with double strike.
When it is over, go back to your normal double axe.
Also, make use of the swords mastery if you can while hitting him with double strike.