"Emphasis on the Serpent Goddess, Coatlicue, summons approximately 1 Macehualtin for every 2 minutes of game length, up to 30 minutes."—In-game description
Coatlicue Worship is a Big Button technology in Age of Empires III: The WarChiefs that is unique to the Aztecs and can be researched at the House once the Colonial Age is reached. Once researched, one Macehualtin for every two minutes the game has passed, up to 30 minutes (for a total of 15 Macehualtins), will appear in the Home City shipment point.
Coatlicue Worship can be a useful way of getting a one-time force of anti-infantry troops, especially when resources are in short supply.