Getting interrupted by casting
The idea for this is putting out as much single-target damage as possible. In order to do that, you will be looking for either a holy or holy/ret build; the key talents to grab are Seal of Command and Spiritual Focus. Jade Dynasty Gold will greatly increase your dps, making almost every other hit as if you got a crit, which by itself is capable of critting. Spiritual Focus will make sure that you can survive without worrying about getting interrupted by casting.