Super mutant overlord

The  is a type of super mutant added to Fallout 3 by the Broken Steel DLC pack. Bethesda revealed that they are evolutionary somewhere between Super Mutant Masters and Super Mutant Behemoths.

Appearances
s appear in the Fallout 3 DLC Broken Steel.

Weapons
Overlords carry Gatling Lasers, Missile Launchers, Tri-Beam Laser Rifles, Sledgehammers and Super Sledges as standard weapons. In a rare case, you may find a Overlord with a Minigun. This has occurred after fast traveling to the National Archives.

If the overlord gets a hold of a two-handed weapon, such as the Chinese Assault Rifle, he will fire it one-handed.

Locations
Basicially, Super Mutant Overlords can appear anywhere where regular Super Mutants appear.

Known locations so far (that respawn):
 * The Capitol Building (Fast travel to The Capitol Building and there is a respawn of two Super Mutant Overlords on the stairs that lead up to the west entrance.)
 * Broadcast Tower KT8 north of Vault 87
 * 3 at Mason Dixon Salvage
 * 2 on the roof of the Statesman Hotel.
 * If you are doing the Reilly's Rangers quest, 1 is likely to spawn in the bar on the top floor of the Statesman Hotel restaurant with a Gatling Laser.
 * South wall of the Citadel
 * Inside the National Archives
 * Hallowed Moors Cemetery
 * 3 at Roosevelt Academy (2 in Roosevelt Arts and Athletics and 1 in Maintenence and Evacuation Tunnel)
 * Clifftop Shacks (this can be a dangerous place to get drawn into a long fight, Deathclaws, Talon Company Mercs, and Enclave are known to randomly spawn very near.
 * West of Rivet City and East of the Jefferson Memorial
 * Three can be found in the L'Enfant District, each carrying one of the three weapons that Overlords are commonly seen using (Tri-Beam Laser Rifle, Super Sledge and Gatling Laser). Careful as there are ALOT of Super Mutants in this area along with destructible cars AND Enclave Troops will land at a intersection you may pass, so things can get pretty hectic. Stealth is advised.
 * Before you finish retrieving the GECK from Vault 87 in the beginning of Murder Pass in Little Lamplight, if you have Broken Steel you will encounter a Super Mutant Overlord.
 * North across the river from the Anchorage War Memorial War Memorial in a tent along with Keller Family Transcript 5 of 5.
 * 1 near Wilhelm's Wharf
 * Museum of Technology, near the Virgo Lander II exhibit.
 * Bailey's Crossroads, en route to the quest Aiding the Outcasts
 * Germantown Police HQ, In the basement. Possibly carrying a Chinese assault rifle one handed, and outside.
 * At Bailey's Crossroads in route to start the quest Aiding the Outcasts, which starts the Anchorage DLC.
 * There are two Overlords west of National Guard Depot, if you walk along the buildings towards Friendship Heights you find the mini encounter in which two of them are fighting two raiders.
 * Inside the Chryslus Building
 * Near Rock Creek Caverns replacing two Super Mutant Masters, they will both be armed with Gatling Lasers
 * In Georgetown, near some of the more important locations
 * In Murder Pass, between Little Lamplight and Vault 87.
 * 2 at the east of the Shelter