Eye of Stone-Eyed Sam
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The eye of Stone-Eyed Sam was, as the pirate's nickname suggested, a stone eye used as a replacement for Sam's own. Further, it was a powerful artifact that served as a miniature prison, trapping as it did the spirit of Montecuhzoma.
Captain Jack Sparrow stole the eye from Sam's body following his death on Isla Esquelética. Believing it to be little more than a trinket, Jack gave it up to the mermaids of Isla Sirena during his brief stay there, though was later informed of its true power by Tia Dalma, who explained it was the only thing preventing the recently-awoken spirit of Hernán Cortés from reclaiming his former power through the Sword of Cortés. Jack negotiated the eye back from the merfolk.
With the eye in his possession, along with two mystical beads that served as activators for the prison, Jack confronted Cortés' spirit on Isla Fortuna. He braided the beads into his hair, the contact serving to unlock the eye and release Montecuhzoma's ghost, which defeated Cortés and revived the dying Tumen before departing.
