Answer:
Human sacrifice.
Step-by-step explanation:
The Aztec religion was a Mesoamerican religion, like others in those territories it had elements of human sacrifice in many of their religious festivities.
They were polytheists, which means that they worship several gods and goddesses, and they often incorporate deities from tribes they conquered into their own practice.
Human sacrifice was highly practiced in all the Aztec´s territory, this practice was widespread throughout Mesoamerica and South America for several centuries. The sacrifices had to be meticulously planned in order to satisfy the god or goddess they were performing the act. Usually, the sacrifices were warriors or slaves. The victims were forced to participate in the ceremony performing dances to be tired and avoid struggling during the sacrifice.
I hope this answer helps you.