Prester Omega is one of a group of humans and superhumans chosen to guard the Concordance Engines; devices created by the Celestials of another universe, capable of altering reality and suspected of being lynchpins to all of reality.
Prester Omega's abilities are unknown, potentially given to him by the Concordance in order to affect it's protection. His abilities allow him to move at superhuman speeds, dispel beings as powerful as the Worthy, Nul and able to disrupt metahuman abilities such as Iron Fist's chi manifestation.
As far as to the creators of the Concordance Engines:
- The machines were built by a group of superhumans called the Presters from an alternate universe where the Celestials had become cosmically suicidal. These "Death Celestials" destroyed their universe and then others. The Presters had escaped and observed the sporadic things in the other universes which had temporarily held back the Death Celestials, and then used the Concordance Engines to recreate those elements on Earth-616. Their intention is to make that Earth into an armory or redoubt against this ultimate cosmic menace.
Fantastic Four Vol. 1, Issue 54 (1966) introduces us to Prester John, monarch of Pentoxere, a kingdom in eastern Asia. Supposedly the descendant of one of the Three Kings, Gaspar, Melchior or Balthasar.
This former monarch is found by Wyatt Wingfoot and the Human Torch in a Survival Chair, a relic technology allowing Prester John to live for at least 700 years as the guardian of the Evil Eye.
The Evil Eye was a powerful weapon/technology/MacGuffin from the early years of the Marvel Universe - I read these stories as a kid and the Evil Eye Saga was one of my most favorite of the time period.
From Wikipedia: Prester John is a centuries-old explorer who was born in an unnamed kingdom in Eastern Asia, which he once ruled. He was an ally of King Richard the Lionhearted and served in his court. He is the possessor of the Evil Eye, a mystic object of power which was bestowed upon him in the extra-dimensional land of Avalon, and which can project vast amounts of energy. He has been a priest, a king, an adventurer, a traveler, and explorer.
Prester John was preserved from the 12th century until modern times in the Chair of Survival by the alchemists of Avalon. When he awoke, he met the Human Torch and Wyatt Wingfoot, and witnessed the seeming destruction of the Evil Eye. Prester John later became temporarily possessed by an alien power-stone, and battled the Thing and Iron Man.
Note Prester Omega sitting by the representation of the Concordance Engine. I say representation because the device is supposedly THE UNIVERSE or a facsimile, that if destroyed could destroy part or all of the Earth-616 universe.
Prester Omega's slumped over appearance is reminiscent of the appearance of Prester John's very first appearance in Fantastic Four all those years ago.
Now add to this idea the the Concordance Engine is capable of wish fulfillment, bridging realities and altering reality as it sees fit, creating matter and energy at will.
The Concordance Engine appeared to give Prester Omega the ability to destroy or displace Nul, one of the Worthy. Prester Omega stopped Nul with almost no effort. Which isn't surprising if you can alter reality.
Prester John claims there is a relationship between he and Prester Omega as "brother knights" protecting other artifacts of power. If so, the relationship between the two characters has not yet been fully explained or explored. It is likely part of the secret history of the world that has been hidden by the Concordance Engine(s) to protect itself/themselves from misuse.
- Dr. Strange theorizes that Prester John's Concordance had possibly been destroyed or lost in the distant past and this may have been why Prester John had gone mad. Prester Omega theorized this as well. See black-captioned thoughts of Prester Omega below:
The object you see pressed against the Silver Surfer's neck is the stellar staff of Prester John, which now has the Evil Eye incorporated into it. It is capable of harming even the likes of the Silver Surfer. (Defenders #3, 2011)
- The Omega symbols now conveniently placed in all of the Prester's hands has been seen before, as well. In the hands of a little known character from the 1970's: Omega, the Unknown, an artificial lifeform from another world. What his relationship to the Prester's and their mission is as yet unknown.