Trecena (13-day period) Atl
The thirteen day period (trecena) that starts with day 1-Atl (Water) is ruled by Chalchihuihtotolin. These are 13 days of instability and unexpected events, of accidents and coincidences: these are good days to gamble a little on a long-shot; bad days to gamble a lot on a sure thing. Every day rollercoasters between all-good and all-bad, between rapture and terror. This trecena advises the priest-warrior to perfect the art of shapeshifting: only by mimicking the nature of water do we become an agent of change rather than a target of it. The purified heart casts no reflection in the smoking mirror.