"In Western Plaquelands, the town of Andorhal has a phased horde quest town. I am not sure if it starts off this way, but I noticed after doing the quests in the area that there were a ton of human farmers rushing in from the Southeast part of the town. These farmers sometimes are coming in huge waves that they get past the Abominations that are supposed to be killing them.
What you can do with these endless waves of human farmers is just stand 5-10 feet in front of the two abominations, out on the farming field a little bit. Hit them with whatever method you have, AoE works best. Stay close enough so that the Abominations hit them as well. You get all the XP if you hit them, even though the abominations are finishing them off.
If you stand at the right spot, you can get anywhere from 10-20 farmers attacking you at once, they die in 1-2 seconds and respawn instantly.
I went from 28 to 34 in about an hour here.
The only downside is that they do NOT drop any loot. You do get XP though just as long as you damage them. If you get too far away from the abominations they won't help you, so start off next to the two abominations then keep working your way out into the farming field until you find your sweet spot.
Again, Horde, it may be final phase dependent... but once you get the quest to stop the waves of farmers then you know that is it. It stays on this phase also, as its the final phase when you complete the quest line.
I was able to AoE as a warrior and use victory rush to heal. Used Stomp and Cleave to AoE.
Enjoy!"