What is "chalchiuhtotolin"

In Aztec mythology, Chalchiuhtotolin ( Nahuatl for "Jade Turkey") was a god of disease and plague. Chalchihuihtotolin, the Jewelled Fowl, Tezcatlipoca's nagual. Chalchihuihtotolin is a symbol of powerful sorcery. Tezcatlipoca can tempt humans into self-destruction, but when he takes his turkey form he can also cleanse them of contamination, absolve them of guilt, and overcome their fate. In the tonalpohualli, Chalchihuihtotolin rules over day Tecpatl (Stone Knife) and over trecena 1-Atl (Water).

The preceding thirteen days are ruled over by Xolotl. Chalchihuihtotolin has a particularly evil side to him. Even though he is shown with the customary green feathers, most codices show him bent over and with black/white eyes, which is a sign reserved for evil gods such as Tezcatlipoca, Mictlantecuhtli, and Xolotl. Another depiction of Chalchiuhtotolin's evil side includes the sharp silver of his talons. His nahual, of course, is a turkey in which he terrorizes villages, bringing disease and sickness.