The 13 Aztec Skulls

The 13 Aztec Skulls are 13 magically artifacts from the television series American Dragon: Jake Long.

History
If the skulls are all together, it would lead to all mystical creatures' doom. Since the Huntsclan heard of it, they decided to make a crusade on finding the skulls finally destroying the mystical creatures. Rose knew that the Huntsman was planning something big, but little does she know that the plan was about the skulls, but she told Jake about what she knows in "Half Baked". In "The Academy", we got a clue that the Huntsman is planning to use the skulls when Sara one of the Oracle Twins mentioned a circle of skulls in her vision. And we found out that the Huntsman's plan is using the skulls in "Breakout" when Gramps said the creature that chased Huntsboys 88 and 89 is an Aztec serpent, guardian of one of the skulls, and we see how much skulls the Huntsman has. One skull was in a cave in "Fool's Gold". And the last skull is inside an Aztec sculpture in the New York Zoo. After Rose made the deal with the Huntsman, she stole the skulls that Jake has in "Homecoming", but before The Huntsman made irreversible wish for the destruction of all mystical creatures, Rose hit him on the back and wish for the destruction of all Huntsclan. And it was bad because Rose was part of them. In order to save her, Jake wished that she was never taken by the Huntsclan and after Rose disappeared, Jake angrily destroyed the skulls and left in his dragon form.