In Karnor's Castle: Spawns on the upper balcony overlooking the entrance of Karnor's Castle, as well as the 'left' courtyard. Hits for a max ~300.
In Al'Kabor's Nightmare: Hits for a max ~13,000 and is slowable; PHs are the "a drolvarg lieutenant" on the Dreadlands island. Note: For all map points of nameds in Al'Kabor's Nightmare (for "alkabormare.txt" map files), see this quest entry.
In Lceanium: Roams on the north side of the zone. Casts Rend Flesh which hit my tank merc for 105k. It casted it every 20 seconds of the fight.