Facing imminent extinction during the final day of Hernan Cortes' assault on Tenochtitlan (August 13th, 1521), many surviving Tenochca withdraw into a designated region of the underworld (Mictlan) which was gifted by the god Huitzilopochtli, to re-build, re-populate and thrive without interference from the outside world. The gods subsequently granted 13 warriors and designated intellectuals, superpowers and immortality in order to ensure strict cultural preservation and maximum potential for advancement. Their immortality is preserved by a well-guarded water source known as the "Healing Waters" AKA fountain of youth.
Over the next five hundred years, the intellectuals integrate themselves into various cultures around the world to develop an understanding of technology, cultural development and languages to ensure their prosperity during the 1000-year integration, always returning to their civilization in the underworld and sharing their teachings with their peers. Their intellectual and technological knowledge rival any country on earth. However, they remain true to their culture and live as they did in the 16th century.
One designated warrior, Amoxtli, later nicknamed "Aztec" by society, has been granted powers of superhuman strength and shapeshifting, which he has spent nearly 500 years developing. He will emerge on earth on the 500th anniversary of their transition to Mictlan to fulfill his destiny. On August 13th, 2021, he will enter the world and find opportunities to help create a more stable, peaceful and sustainable planet, using his powers and knowledge.
