[Cichard]

a boss will only resist stuns. Currently there is a diminishing return on stuns. So say you have a 6 second then 3 then 1, at this point if you stun again it will do nothing but the damage. For a specific set of time im not sure exactly how long till DR resets. But there is no DR on silence. Othere then stun and i think slow there is no DR on anything else. you can cast a dot on a mob as many times as you want and unless you dont have enough accuraccy to hit the mob the dot will always last its full duration.