If you want a creature that is rare and extremely powerful, then you have come to the right place. This piece holds something called a Mayan Serpent Djinn. These are the sons of Hunab-Ku who is the principal deity of the Mayan Pantheon. He is known as the "Sole God" without whom no other god would exist and without whom Mayan magic would not exist.
Hunab-Ku takes the form of a jaguar, but his sons take the form of a serpent. They are serpents of knowledge that are also a type of djinn that can grant wishes and knowledge to the person who needs it. When you own this piece, no only will your serpent djinn grant you the wishes that you ask for (within reason, it will not kill, grant immortality, etc.), it will also bring you the knowledge of ancient Mayan magic, including their ability to control time.