I got props for posting this idea elsewhere, so I'd like to felsh it out a bit more here. I will use some imagination but try to entwine my storyline with the official one so that we can see what might become of Duran and the Brood War epilogue. The Xel'Naga colonists arrived in the galaxy when mammals were just beginning to diverge from reptiles on a tiny blue planet that hardly even caught the colonists' attention. They were elated to have finally arrived, even with their vast world ships and supreme technology. The first thing their leaders did was to pay homage to their forefathers, who had begun the journey form their distant home in a galaxy halfway across the universe. Their forefathers had set off in the world ships with the purpose of living out a higher purpose than the conflict that embroiled their home galaxy where other Xel'Naga factions fought a relentless struggle with the forces of the Kel'Modan archbeing. Xel'Naga scholars had questioned for eons whether the extra-universal Ke'lModan was truly alive, or whether it was merely an expression of the physical laws of another universe exerting themselves in this one. The "war" that the Xel'Naga and the Kel'Modan fought was also a simpleton's term for something much more difficult to identify--the Kel'Modan acted on low-entropy macrostructures and warped them, and this was essentially the only way to detect the incursions of the Ke'lModan into the universe. The Xel'Naga responded by destroying that which the Ke'lModan had "corrupted," or as some scholars preferred to say, merely "changed." Sacred artifacts that the Xel'Naga had so carefully painted across light-years of space were slowly twisted into bizarre new forms of matter, or re-arranged to conduct stellar energies in such a way that whole sectors became inhospitable for life. There was in fact little disagreement among Xel'Naga intelligentsia that the Kel'Modan's influence had to be resisted, because everywhere it appeared its influx accelerated, but other Xel'Naga even held to a luddite view, quick to point out that the Xel'Naga constructions were the only points where the Kel'Modan seemed to be able to establish a foothold. It was argued by these few, though they were frequently exiled for the view, that the Xel'Naga should insulate the universe once and for all by dismantling their vast interstellar civilization and returning to ancient tribal ways. But, whether the entire process truly constituted a "war" was still debateable no matter which faction was to be believed--for the Kel'Modan's activity could be largely explained in mathematical terms if one merely hypothesized an extra-universal order that could propagate itself into regions of this universe at a rate proportional to the entropic density, as if some sort of crystal were growing. And, though the effects of the Kel'Modan were devastating, they only manifested themselves over millenia. A few Xel'Naga scientists, most of them neophytes, even entertained the notion that the Kel'Modan didn't really exist, like the caloric substance or the luminiferous aether, and was merely a convenient way to blame another universe for pollution created by Xel'Naga space travel. But it was with an ardent spirit and conviction that the Xel'Naga ways were righteous and pure that the colonists arrived into the galaxy that an equally inquisitve and diverse, though much shorter-lived and volatile, species would one day call the Milky Way. Nothing of the Kel'Modan could be detected on either their world ships or in any of the myriad worlds the Xel'Naga visited before finally settling on a planet that would one day come to be known as Aiur. Though they were several generations and many eons removed from the crews of the wrold ships that had begun the voyage, they set about to erect their progenitor's vision across the fertile starscape. First, they created the race that would one day become known as the Protoss. They stood in wonderment as their new creation took its first steps about its home planet, made its first utterances of rational thought, and began to write great works of literature, music, and psionic hymns. But, even after such rejoicing came twinges of pain, as the Xel'Naga's creations began to fight amongst themselves. Undaunted, the Xel'Naga left the world under the assurances of their most learned theorists that the strife which temporarily consumed their creation would resolve itself. Echoes of the Xel'Naga luddite mentality were apparent, but in this case the colonists agreed by a narrow majority to leave their children to mature on their own. The next planet the colonists came to pulsed with volcanic tides from deep within its mantle, barren on the surface in comparison to the Protoss homeworld but filled with raw energy. The Xel'Naga colonists engaged in a different experiment this time, to create a being capable of thriving on the planet's raw energy but interconnected at much more fundamental levels, thinking that such a being would make a smoother yet still rapid evolution into a harmonius existence with its creators. The plan began with superb results--the Zerg forms fluorished all over the ash-covered planet, thriving on the raw materials and volcanic energy that little of any significant complexity could otherwise master. But, like the protoss before them, the Zerg soon began to tear at one another as they came to fill their world. Determined not to fail again, the Xel'Naga created an additional level of interconnectedness for the Zerg, to directly focus the psionic fields that the Xel'Naga had first assumed would be stable enough on their own. This Overmind also delivered excellent results, in the beginning. But, the Xel'Naga witnessed a third failure as soon as the Overmind grew to the limits of its planet and hungered for more. The Overmind began to send its sweeping psionic field out into space like tentacles, finally succeeding in luring a species to the planet that, primitve though it was in comparison to the Xel'Naga, provided the Zerg with the means to escape the planet and propagate themselves with no foreseeable limit. As the first waves of Zerg began to bombard the Zel'naga world ships, a formerly muted school of Xel'Naga colonial thinkers brought their dire predictions to the fore: the patterns of failure in this new Galaxy were the same as those observed in the Xel'Naga's home space, only this time afflicting biological organisms and inciting them to propagate at even greater rates. Until that moment, Xel'Naga mystics had been gaining more and more credibility with their fabulous tales of touching Zerg creatures with their hands one day, only to find them agressive and agitated the next, as if possessed by demons. It was then that all the Xel'Naga colonists had to face the shuddering reality that had followed them across the universe: the Kel'Modan was real. It was there, lurking among them, twisting their living creations day by day rather than changing their lifeless edifices over eons. Worse yet, analysis of captured Zerg chromosomes revealed similar patterns of mutation and directed evolution as could be seen in the nearly forgotten comparisons of the original protoss creation to the violent beings the colonists had declared a failure. The Kel'Modan was intelligent. And this was war. (Epilogue: Duran is an expression of the Kel'Modan. Not a being per se, but an expression of an extra-universal evil that the Xel'Naga colonists were in fact able to contain, but not eradicate. With the resurgence of the Zerg and the collapse of the protoss, the Kel'Modan is beginning a new influx into the universe--but whether one caused the other or vice-versa is something any remaining Xel'Naga scientists would vigorously debate. The more urgent issue, though, is how to repulse the Kel'Modan this time around.)
How interesting. There already is a thread about Duran though. Oh and the Xel' Naga could not have inhabited Aiur since it was one of the planets they found in their travels
I don't think I have that the Xel'Naga inhabited Airu, except as colonists who did find the world after traveling halfway across the universe... Sorry if I implied otherwise or wasn't clear. Also, I understand that there is another thread about Duran, but this was a different theory altogether so I gave it a new slot. And, thanks for the powerUp lurkers_lurk!
Note: The Xel' Naga did not create the protoss, they merely altered them with their Khaydarin Crystals. The protoss were already living on Aiur when the Xel' Naga arrived, although they were uncivilized. Source: http://starcraft.wikia.com/wiki/Protoss
The Protoss are the first-born of the Xel'Naga, they were created using the Khaydarin cristals. They can be considered a product of the Xel'Naga race without doubt. I think that what kills this idea is that Duran said "He serves a much higher power". And in the campaign video, Zeratul says that the Xel'Naga have returned, and hold the artifact to the end of all things. Dude that to me seems like a "higher power". It also makes sense.