Could use the shrinking potion magic thing to shrink the antler so we can retrieve it.

Attacking the brain is the best plan. The brain stem connects the spinal cord with the spinal cord. It is also the part of the brain where the vital functions occur. The lowest part of the brain is located in the brain stem, the meddula oblangata. Directly above the meddula oblangata are the pons. The pons is the band of nerves that connect the cerebrum, the cerebellum, and the meddula oblangata. The meddula oblangata is in the middle of the brain and controls breathing. So we attack the meddula oblengata and we kill the beast. Shrink the antler and bobs your uncle. We now need a structure and a leader to put the plan into action.

Just an idea.