I'm thinking that I'll play a scholar, who ordered its tribe to construct a great tower (once, y'know, there was technology enough to build towers) at the hottest and most forbidding part of the wasteland that is now the province of Koyatia, using its arcane might to keep them safe from death by the tremendous heat, if not the usual conatruction-related maladies.

Once the tower was complete, its purpose was revealed: to serve as a storehouse for all the world's knowledge.  The Child of Aton then offered its followers a choice: stay and serve as the keepers of the tower, or leave with the blessing and protection of their former master.  After the years of back breaking labor, many chose to leave, and established the first tribes of Koyatia, some of which survive, in some form, to the present day.

Those who remained were henceforth known as the Devoted.  The Child of Aton entered into an enchanted bargain with its Devoted: "All who dedicate their lived to the protection and stewardship of my tower and library shall know power arcane."

From then on, the Devoted would serve their master faithfully.  Some catalogued and maintained the tower's Scrolls and times, others safeguarded it against those who would steal or destroy what lay within, and others still would go out into the world, seeking new knowledge to add to their master's trove.  The most powerful of the Devoted would change physically over time, gaining traits that resembled their master--such ad feathers sprouting from their backs, or eyes growing in their foreheads.

The tower had been built out of the way on purpose.  The desert served to keep away those who packed either the minimum intelligence, to plan the journey, resolution, to make the journey.  Those who reached the tower were free to learn anything contained within its walls, so long as they did not try to prevent others from doing the same.  If they managed to gain an audience, they could even bargain with the Child of Aton for some of its knowledge.

Of course, things changed after the Seer bound all her Siblings in chains...