Aztec
Legend states that when the Mexicans arrived in the Anahuac Valley around Lake Texcoco, the Mexica/Aztec decided to learn what they could from the other people who judged them for being the least civilized. Since the Aztecs adopted and merged several traditions with their earlier ones, they had multiple creation myths.
One such myth is the Five Suns, where four great ages before the present world each ended with destruction at the hands of the leading deity figures. Think the Reapers in Mass Effect, but instead of giant death robots, the inhabitants of the world were done away by jaguars, hurricanes, fire, and a flood. In one variation of the Five Suns myth, Huitzilopochtli, the god of war, was born from his mother Coatlicue and immediately started his war with the Tzitzimitl, gods of the Southern stars. And you thought you had trouble with your siblings.
In the legend, Huitzilopochtli straight up kills the Tzitzimitl literally the moment he leaves the womb. That’d make for a short game, so the three siblings would flee just before you can deliver the killing blow to them. Not exactly keen on being nearly killed before being born, Huitzilopochtli decides to hunt them down and make them pay for their failed assassination attempt. You’d be playing as a newly born god, one who doesn’t have his full powers yet. In mythology, Huitzilopochtli is the god of fire and sun and human sacrifice. So fighting monsters and saving humans from them would add followers to your count who would gladly sacrifice themselves for you. The sacrifices would be currency you could use to upgrade your powers or the source of a last minute, no takebacks save before you die, like the Gold Orb in Devil May Cry. While you weigh that decision, go on and burn your enemies to dust, sun boy!
