Hrrrgyf is a level 10-12 hill cat that lives with the group of hill cats near the entrance to Darkness Falls. He cons blue to orange to a level 11 warrior. He has been seen to spawn at 10.25,26.25 and 12.27, 27.26 in Vale of Mularn. He wanders from there. You may have to kill all the hill cats and small hill cats to get him to spawn.
Hrrrgyf requires minor mammology potions.