Just killed Wiknak Grimglom.
Spent about 3 hours there.
The grimlings have to win the war. Be in charge.
The area outside of the owlbear caves is big. Zone wall to the north, a ridge line to the east and west. The pathway from Shar Vahl heading east.
The PH can spawn in many different spots in that area. And it is the only mob that spawns there.
I left the guards and the 1 wandering mob that exits the cave alone.
PH's I killed. a grimling grunt, a grimling recruit and a grimling soldier. These are PH's for each other.
Using track on normal, I could see when it would respawn.
Then Bam, Wiknak Grimglom. She dropped, Mask of the Grimling Hunter.