I have added a pinch of dirt from the tainted ground of Terrordale in the Eastern Plaguelands to the censer. You will now use this censer to find areas there that show signs of spiritual turmoil and disturbance. Look for green auras that permeate the ground as the physical world buckles under the torment of the spirit realm and use the censer to drive out the evil spirits.
When you have passed sufficient judgment on the spirits there, you will be ready to proceed.
Well done, <name>. To render the judgment of the Light on those that dwell in darkness is a task we must approach with vim and zeal; you have done just that with your sacrifice in Ironforge and your judgments of the spirits in Terrordale.
Your next steps will call on both sacrifice and judgment again as you now strive to reclaim the spirit of a fallen charger who now serves a Death Knight known as Darkreaver.