Atlan

Atlans were enormous bipedal war machines used by the Night Sentinels in their war against the demonic forces of Hell. No fully-functional Atlan is known to have survived the demon conquest of Argent D'Nur, though semi-functional examples can be found scattered across the shores of Hell.

Design
Atlans are massive humanoid machines somewhat similar in overall design to the Praetor Suit, with a similar green color scheme. The main difference in shape is the head, which is more or less conformal to the shoulders rather than having a distinct neck, and has a pair of large horns reminiscent of a Viking helm. Their known weaponry consists of energy beams fired from the palms of their hands, enormous lances projecting red glowing blades similar to that of a Crucible, and a shoulder-mounted beam cannon. Compared to ARC's mechanized walkers, the Atlans are far superior in firepower and weaponry as they can kill the Titans easily.

In line with the Sentinel rejection of Argent Energy, the Atlans did not use it: they were powered exclusively by "Sentinel Energy," seemingly the untainted essence derived from the Wraiths prior to their imprisonment. This energy was supplied by a number of giant "Sentinel Batteries" inserted into the machine at various key locations.

Fate
Atlans are found all across Argent D'Nur and within Hell, often frozen in mid-duel with Titans which seemingly expired just as the machines ran out of power. According to the Ligra Sultagenta, their operators abandoned their machines after running them to their limits and fought on foot, but ultimately all but the Doom Slayer fell in the final battle.

The Betrayer's Atlan stands in a lava flow in the area he has made his home. The disgraced former Night Sentinel defends himself with four detached Atlan shoulder cannons rigged to a network of laser tripwires.

The Fortress of Doom contains a limbless Atlan torso in what appears to be a service gantry on its lower level, presumably belonging to either the Doom Slayer himself or the previous owner of the station.

Trivia

 * The Atlans are similar but bigger when compared to ARC Mechs.