This mob spawns at -855, -855, -505 which is the second-most-southeast room of the zone where the cliknar caves are, south side of the room.
In the Foundation: Spawns in place of cliknar in the western part of the zone: One known location is just outside the south entrance to the cliknar cave at about -440, 2200.
In Underquarry, a master scout can spawn at -855, -855, -505 which is the second-most-southeast room of the zone where the cliknar caves are, south side of the room. PH could be a cliknar skirmish drone.