I'm able to kill masters at lvl 77...
My equipment: Ancient Falchion, Golden Shield of Valour, Heroic Amulet, Full ancient with warden pants.
My stats: 65 5 30 305
Well, I only killed one Master so far, might have gotten a weaker one, idk. :p
1. I didn't say i was not able to at a lower level
2. Masters are random. On my mage, i can kill a master with little health takenn away. But that's rare. Sometimes i can get them half way, sometime even more. But what makes them so random is that someyimes ill die before doing 1/4 damage
3. My point is, even at level 83, dps warriors dont deal as much damage as tanks. Keep in mind that dps is a rate at which damage is done, not total damage done