OK, soooo in WG ur immune if ur on the graveyard.. Spiritual immunity. So u leave the GY and u arent. But if u use ur demonic teleport to get back up u'll be immune again. I am farming kills as we speak. I have a healer on the GY taking no dmg.. healing me as i am down there.. then i teleport back up to the graveyard when i'm about to die. That way all dmg done to me when i'm at say, 1% hp. Is gone.
This also helps to "despawn" the Alliance npc's when u have control of their graveyard after WG. The best way to "despawn" them is a nice howl of terror, idk if you have to have instant or not but i do.
Have fun. This is not a repost like people have put down there.