One Option: Fire
Burn Bwonsamdi Offerings, Armory Supplies, Food Cache, and Medicinal Supplies in the Necropolis.
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.
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