"Worship of Cipactli, the sea monster, musters four Tlaloc Canoes."—In-game description
Cipactli 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 Dock once the Fortress Age is reached. Once researched, four Tlaloc Canoes will appear in the Home City naval shipment point.
Given that four Tlaloc Canoes would have costed 1,600 wood and 400 coin to train, and that food is usually much easier to come by, Cipactli Worship quite a good choice. It is available for research even if the player already has the maximum number of Tlaloc Canoes, so Aztec players who want to field a large navy should train as many Tlaloc Canoes as possible before researching this technology, giving them a total of 9 Tlaloc Canoes (13 if the Admiralty Home City Card is sent).