Why is it so hard to kill Raze with a level 32 Ranger? My build probably sucks and my weapon and armor are probably not the best at that point but still...

If I don't jump around like mad he and his million minions kill me in seconds. I don't even reach the point where he runs to the chambers to heal himself.

I must be doing something completely wrong at this point. Trying to reset my skills doesn't change much.

My build is mostly dex (half of the points went there, the others mostly split between health and mana).