Pirate's Charm

The Pirate's Charm was a heavily modified Gossip Stone used by Tetra the pirate to communicate with others telepathically. Tetra slipped the stone into Link's pocket after she launched him into the Forsaken Fortress. Tetra had the charm, because, unaware to her, she was the princess of the Royal Family who uses these charms.

Later on in Link's adventure, the King of Red Lions used it to communicate with Link when they were separated.