Many eons ago, while the universe was still young, there came to be a race of tall men made of metal, known by many as Gou'Lemians. No one knew how they came to be and who made them, but they took it upon themselves to guard the universe, long before Warriors of Eternity were founded. For generations, they performed their duty with diligence, protecting the innocent and helping those in need. Tall, powerful and thought to be indestructible, they were a force to be reckoned with for whoever dared to confront them, however they always made it known that they will never use their power to opress or conquer, just to protect. Until one day, they all mysteriously vanished....all but one, named Staltor.

Without any clues regarding what happened to his brethren, and without a sense of purpose, this Gou'Lemian wandered the universe for many years, occasionally helping some poor soul or defending a planet or two in his path if it was threatened by some evil force. Then one day, he heard a call from beyond the cosmos, a call hailing from a planet called Ganelomm. A call for any champion brave enough to come and help fight the incoming invasion of Chaos forces, which threatened to destroy the universe. Without a second thought, Staltor headed for Ganelomm, and met not only the priestess who sent out the call, but also a small but growing group of warriors who also answered the call. Having found a new purpose, and someone he can call his brethren again, Staltor provided much needed support in the future battles, his tremendous might and raw physical strength causing absolute terror among Chaos forces that stood in his path and eventually, he became one of the Founding Four that created Warriors of Eternity. However, being a Gou'Lemian, he was virtually immortal, and so he was pained to see many of his friends and allies pass away into the afterlife for many years to come. Eventually, he decided to voluntarily pass on Beyond the Veil and join the other spirits, but not before leaving the final gift to the physical realm; whoever may be found worthy shall inherit his physical form and the title of Steel Sentinel, to guard over that generation of Warriors of Eternity. That honor befell a humble, reserved young human from Earth, Andrei Colochev, who was at first reluctant about accepting this huge honor and responsibility, but eventually, with help from Valdora and his friends, became a true Steel Sentinel, which made Staltor proud.

While posessing limited weaponry, Steel Sentinel excels at close combat, preferring to get as close as possible to the enemy and then pummel it into dust. His powerful armor is capable of taking insane ammounts of punishment before the damage begins to show-it's been theorized that it can withstand the pressure of a black hole or supernova blast, though none have attempted to use that ammount of power against him so far...