After the Great Catastrophe, and the mysterious disappearance of the Old Ones, an isolated temple complex dedicated to the worship of Tepok was erected just west of the Spine of Sotek, in the liminal space between the lush tropics of the Forbidden Jungle and the barren wastes of the Copper Desert. A sister city to Hexoatl, this remote academic sanctuary was ordained and organized under the rule of the Slann mage-priest Cihuapiltzintli, a descendant of the great Lord Mazdamundi. A relatively young Slann, Cihuapiltzintli from his first moments committed his life to studying the scattered fragments of knowledge left behind by his Old One mentors. Such intense discernment required almost total peace and solitude, though in world fraught with warfare and treachery these were rare goods and dearly bought. Before even the earliest portents of the End Times were known, Cihuapiltzintli ordered Cemilhuitequitl -wisest and eldest of the manifold Skink star-priests who attended to their great Slann master- to seek out and gather any artefacts of Tepok which might help to better decipher the Great Plan of the Old Ones. Many battles were fought in pursuit of such treasures, and even the rumor of such an important item would be enough to warrant stealthy investigation by Chameleon Skinks under Cemilhuitequitl's direction. As the ancient Slann began to perceive the inevitable success of the depraved Chaos Gods, and the destruction that would accompany their dark triumph, they saw the necessity of devising alternative approaches to completing the great work of the Old Ones. Cihuapiltzintli summoned his attendees, sharing only the details most pertinent to the tasks he gave them. Under the orders of his Skink star-priests, Kroxigor minions and their great Stegadon beasts of burden labored together, carefully arraying great petroglyphs of stone and gold along ley lines in the jungles surrounding their fane, in the process carving out wandering pathways which shimmered and pulsed rhythmically with magickal energies. Throughout all of this, Cihuapiltzintli, as his kind were wont to do, lay upon his palanquin at the pinnacle of his ziggurat and silently observed all that was occurring before him. He waited patiently until the stars of the great Koatl's Claw constellation aligned themselves properly, and just moments before the hellish warpfire of the collapsing moon fell upon his abode he stirred himself, raising a single finger skywards. With this simple but powerful gesture, the skies over the temple complex briefly cleared, and Tepoktiltan -along with its inhabitants and all of the lands upon which their great petroglyphs had been arranged- seemingly disappeared into the nothing that rapidly consumed the world.
Thanks, I drew a lot of inspiration from the existing WHFB lore and then used a Mayan to English translator tool to come up with my character names- in the Nahuatl dialect the Slann name means "youngest" and the Skink star-priest's name means "the work of a day". I'll definitely add more depth as I go, but I like having a lore-driven backstory for how and why my army exists.
The manifold host of Tepoktiltan were transfixed beneath a dome of shimmering magickal energy, illuminated by the blue-white glow of the realm of Hysh. All was preserved exactly as Cihuapiltzintli remembered it, except that the entire temple complex and its surrounds now floated through the atmosphere of Azyr as giant flat-topped island of rock, one half wreathed in steaming jungle and the other fading into an arid wind-swept desert. The first of the lizardmen to stir was the Skink Oracle, Teteoyomacani.(Priest Who Administers the Sacraments) He walked bewildered out of his now defunct orrery, along the cloister, and into the courtyard of his monastery, all the while muttering prayers to the Old Ones for guidance in understanding this next phase of the Great Plan. Slowly the other lizardmen awoke, rising from a shared slumber as though the great battle of the End Times had been some hellish collective nightmare. Star-Priest Cemilhuitequitl found himself looking up at new and foreign stars, pondering what portends and signs he might discern. After a time he shook himself from stargazing, and dispatched orders to his most trusted Saurus Oldblood. Tlacacemele(Monster In Nature), was to lead his warriors and survey all parts of their new levitating home, while the wiser Skink priests and attendees were to begin calculating their flying temple-cities' approach angles to other heavenly bodies of the realm. Tepoktiltan would not ever again find itself unprepared or undefended.