Ix Chel and Chak Chel is a collectible photo found in Shadow of the Tomb Raider. It is part of Lara's Notebook collection, gained automatically by playing through Cozumel.
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Ix Chel and Chak Chel are two faces of the same goddess.
Ix Chel is the young woman and represents life and healing. She is associated with the full moon. Chak Chel is the old woman and represents death. She is associated with the new moon.
Together as the twins: symbols of duality and the cycle of life and death.