This quest is not available in game.
Deep within the Slag Pit of the Cauldron, in the Searing Gorge, you will find the traitorous Dark Iron dwarf named Overseer Maltorius.
Slay Overseer Maltorius and take his head. Return the head to Lookout Captain Lolo Longstriker in the Searing Gorge for your reward.
By order o' 'is eminence, Overseer Oilfist, the rogue Thorium Brotherhood agent an' newly hired commander o' the Dark Iron Slag Pit crew o' the Cauldron, Overseer Maltorius, is to be killed an' 'is head brung back as proof o' the deed.
See Lookout Captan Lolo Longstriker fer the reward on this bounty.