Overseer Maltorius is a level 50 named Dark Iron Dwarf found deep in the Slag Pit in Searing Gorge. Lookout Captain Lolo Longstriker wants Maltorius' head. In addition, Maltorius guards the sought by Master Smith Burninate. To reach him, head into The Cauldron from the east side and enter the cave there (the one farthest east). Cross the metal bridge, then head into the small archway on the left side of the room. Strangely, his shadow bolt ability is vulnerable to spell push back, most npcs are immune to this effect.