Hey folks, finally got 5 posts so its time to open a thread.
This is my first thread so if this is a repost just delete it.
In burning steps, theres a npc called Grark Lorkrub. He is in a keep at 40,34. While beating the shit out of him, there will be an emote about 10% of his hp left and he will return to his original place recovering his hp. The nice part is that you wont stop attacking him. So if you have bloodworms as dk, they will heal you all the time.
Dont know if this works for horde too, could be a quest-npc.
So have fun