Receive decaying mist receptacle from Yersenia. Place at fallen stump ( 512, 13, -110 ) /waypoint 512, 13, -110 south of Karnor's Castle. A group of drolvarg fodderlings (lvl 65-66vv Heroic) will spawn or already be spawned.
Be sure your group is very, very close to you and that you are practically on top of the teleportation NPC before you agree to be teleported. Some players have been left behind. The game mechanic appears to be very short-ranged.
Also, be prepared for an instantaneous fight after teleporting.