Okay, so you know how sometimes grown-ups like to tell scary stories about the end of the world? Well, a long time ago, the Aztecs had some stories like that too, and we call it "ancient Aztec eschatology".
The Aztecs were a group of people who lived in what is now Mexico many hundreds of years ago. They had a religion that was very different from what many people believe today. They believed that the world went through cycles, and that each cycle came to an end before a new one began.
One of the stories they had was about a god named Quetzalcoatl. He was supposed to be a good god who helped create the world and bring people to it. But the Aztecs believed that one day he would come back to Earth and end the current cycle of the world. This was supposed to happen on a specific day in the Aztec calendar, and it would be a big deal.
Another story they had was about a goddess named Tlazolteotl. She was a sort of goddess of sin and purification. The Aztecs believed that at the end of each cycle, she would come and take away all the bad things people had done, and make the world clean again. That way, when the new cycle began, everyone would be pure and good again.
The Aztecs also believed that when a cycle ended, the Sun would die and the world would be plunged into darkness. They would try to keep the Sun from dying by performing rituals and sacrifices to their gods. This is why they built big temples and made sacrifices of people and animals – because they believed it would keep the world going.
Overall, ancient Aztec eschatology was a way for the Aztecs to understand the world they lived in and what might happen in the future. It helped them make sense of things like death and the cycle of life, and it gave them a sense of purpose in trying to keep the world going.