This guy was standing @ LOC 370, 180, just to the right as you enter the throne room area. I spent hours standing directly in front of the throne, to catch the two gorilla spawns, but Dismay never spawned. To save you guys some time, make sure to clear all four gorilla spawn points throughout the room, not just the two in front of the throne.
He dropped the Stonebladed Axe of Dismay.