Artefacts

Key of Chak Chel
Found in the Temple of the Moon in Cozumel, Mexico. There was a mural on the wall prewarning those who wanted to take the item, that they would unleash catastrophies upon the world. There was also an inscription: "The Key to Ix Chel's heart unlocks the Cleansing".  

Silver Statuette
A serpent-shaped statuette found in an ancient Maya tomb located in the the Lost City of Paititi. It is in fact a key for unlocking certain doors in the Upper District of Paititi. 

Silver Box of Ix Chel
The Silver Box of Ix Chel holds the power to summon the god Kukulkan, but it needs the Key of Chak Chel to unlock it.

It was created by the Mother Protector, who also created the Yaaxil to protect the Box from falling into the wrong hands. Its original resting place of the Silver Box was in the Cenote but it was moved in the early 1500s by a Jesuit missionary called Andres Lopez. He was tasked by Trinity to find and retrieve the box but Lopez realised the importance of the item. He had agreed with the Emperor of Paititi, the Sinchi Chiqa to take the box away from Paititi. Lopez took the artefact to the Mission of San Juan, having a special hiding place created to house it.