Super mutant overlord

The  is a type of Vault 87 Super Mutant. They are evolutionarily somewhere between Super Mutant Masters and Super Mutant Behemoths.

Characteristics
Normal: Tri-beam Laser:

Super Mutant Overlords are some of the toughest enemies in Fallout 3, wielding powerful weapons and possessing 3 times as much health as a Deathclaw or Sentry Bot.

Weapons
Overlords carry Gatling Lasers, Missile Launchers, Tri-Beam Laser Rifles, and Super Sledges as standard weapons. In a rare case, you may find an Overlord with a Minigun, Assault Rifle, AER9 Laser Rifle, or Chinese Assault Rifle.

If an Overlord picks up a rifle normally used by other Mutants, like a Chinese Assault Rifle, they will use only one hand to fire it.

It appears that they are most commonly equipped with Tri-Beam Laser Rifles as ranged weapons, this can be problematic (especially on higher difficulty levels) since they inflict an extra 40 damage per shot even if you have 85% damage resistance they can still knock off roughly 25% of your health (assuming you have nearly 600 hp) making Overlords exceptionally deadly with this weapon.

Locations
Super Mutant Overlords can be encountered anywhere where regular Super Mutants appear.

Appearances
s appear in the Fallout 3 add-ons Broken Steel and Mothership Zeta.