The Crimson Fire is a collectible photo found in Shadow of the Tomb Raider. It is part of Lara's Notebook collection, gained automatically by playing through the City of the Serpent.
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The Yaaxil are the descendants of the creators of the Key of Chak Chel and the Silver Box of Ix Chel.
In the centuries since Lopez stole the Box four hundred years ago, they lost their purpose. Now they protect the site where the Ritual of the Silver Box will take place. even though their minds have faded, their purpose remains intact -- they will fight and repel anyone entering the holy City of the Serpent.
They are led by a priestess known as the Crimson Fire. She represents Chak Chel and along with Ix Chel, she is charged with completing the ritual of the Silver Box and guiding Ix Chel in her sacrifice of the sun's power. Once it is completed, the Crimson Fire and all the Yaaxil will return to the heavens, where the Key and the Box were forged.