Hunters. Not only can they see through the cloak but they can fire on the move so you don't have to worry about staying in the warlock area (it takes a sec before the damage kicks in, you'll lose some health but if you keep them moving they wont usually die). They also eat warlocks for breakfast. Combine with purifying flames and you can devastate hordes of warlocks. Or a good pillar of restoration can usually offset the damage a fair bit.
I agree on the shaman shield though. It is impossible to do that as a player unless the game gives us pauses that you can issue orders during or some form of autocast. As a result it gives the AI a HUGE advantage as that is one of the better abilities and shamans tend to be plentiful.
Last edited by Ravenhoff; 07/08/13 06:19 PM.