The Judge Moose (Green-Busch Fertilizer)
Liberate the Green Busch Fertilizer outpost in John's Region, and speak to the starred NPC to begin this mission.
Follow your marker to the far south of John's Region.
Find it and open fire, preferably with something automatic. The moose will respond by becoming a phantasmal moose stampede.
Unlike the Judge Cougar, stampedes are the only illusion this beast has. Shoot every moose you see until the last one bites the dust, ending the mission.
You can loot the moose, but you only get regular moose skin.