After mercenary duo Rough the Skunk and Tumble the Skunk liberated Barricade Town from Badniks and subsequently conquered it for themselves near the end of the war between the Eggman Empire and the Resistance, Death Egg Robot sentinels and Egg Pawns began stalking the town. (StH: #3)
After Sonic the Hedgehog thwarted Dr. Eggman at the end of the war, the doctor disappeared while the Death Egg Robot sentinels and the rest of his robot army remained. Without a leader however, the Death Egg Robot sentinels were directionless and no longer a unified threat. Even so, they would still randomly attack anyone they came across (although such incidents were more accidental than aggression-based). Eventually, the Death Egg Robot sentinels came under the control of Neo Metal Sonic, who made them and their fellow robots more cohesive. (StH: #1, #2, #3, #7)
Not long after, Knuckles the Echidna destroyed at least one Death Egg Robot sentinel that was stalking earlier said town. The other one as well as the previously seen Egg Pawns seemed to be absent. (StH: #3)
The Death Egg Robot sentinel is designed after the original Death Egg Robot, but several times larger, being over three times the size of an apartment building. It has an egg-shaped bodies with a narrow pelvis, stubby and heavily armored legs, thin arms with cone-like forearms, thick gauntlets, cap-shaped shoulders attached to bars rather than sockets, three straight spikes for fingers, and a jet pack on its back. It also has triangular markings on its chest and a dome-shaped head. The face of the Death Egg Robot sentinel is also almost blank, with the exception of a single red eye and a red field for a mouth. It is also completely gray and black with glowing red outlines.
Basically, the Death Egg Robot sentinel is a mindless and silent drone programmed to follow its leader's every command. As such, when left without a leader to follow, it becomes directionless and only able to cause harm by accident. Under a guiding force however, it is a cold and merciless machine who carries out their commands without question.
The Death Egg Robot sentinel's abilities are currently unknown, as it was only ever shown defeated by Knuckles the Echidna.
- The Death Egg Robot sentinel was based on the robot of the same name in the Sonic the Hedgehog video game series where it first appeared in Sonic Forces. It was unnamed in the comic, but is considered tier 2 canon by this site's canon policy, as it does not contradict already established canon from tier 1.