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 2.5 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 but they will never use two rifles at once against you.

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 but only at high levels.

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