GRIEFING!
First off:
- This only works with the Battlemaster NPC's of factions that which you are neutral with.
- You must be a death knight specced in Master of Ghouls.
- This will not work in Dalaran since the Battlemasters are portals.
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How do you do it?
When you target a neutral battlemaster, let's say in Orgrimmar, you are able to hit your ghouls Leap ability and he will leap at the NPC despite him being of friendly/neutral/hostile (most people know about this).
However, the Battlemaster will react and follow your ghoul! Not just one, if you set him to follow you and you walk near the other neutral battlemasters they will also attack your ghoul until he dies, then attack you. You will be unable to attack, as well as your ghoul.
However, if you have a healer nearby, he can heal your ghoul, and you can use it's defensive ability to reduce damage whenever it's up. The healer will not aggro unless the ghoul dies.
So what you can do is run outside of the Battlemaster area, and go behind the building with the NPCs. They will not respawn because they are not dead, and players will be wondering where the hell they went.
I'll post screenshots in a bit. I searched and could not come across anything similar.