One Option: Fire

Objectives
Burn Bwonsamdi Offerings, Armory Supplies, Food Cache, and Medicinal Supplies in the Necropolis.
 * Bwonsamdi offerings destroyed
 * Medicinal supplies destroyed
 * Food cache destroyed
 * Armory supplies destroyed

Description
Here I thought things couldn't get worse, but now we have the Horde making camp around the home of some death god.

I've got a good idea of what they've brought, thanks to my time in the first three wars. Medicine, armor, food...

And probably offerings for this Bwonsamdi fella. Destroy all of these supplies to let the Horde know we won't let them stay here.

Rewards
You will receive:
 * 17,850 XP
 * 17,850 XP

Progress
You destroy those supplies yet?

Completion
The Horde will be forced to retreat from the Necropolis without their supplies. A good win for us.