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Sanddollar

Sand dollar shell.

Sand dollars are a common type of shell, often found on beaches, where they are washed ashore by the ocean waves.

Percy Jackson and the Olympians

The Battle of the Labyrinth

Towards the end of the book, Percy Jackson receives a sand dollar as a gift for his fifteenth birthday from his father, Poseidon. Not knowing when or how he was supposed use it, Percy adds it to his camp necklace.

The Last Olympian

Percy uses his sand dollar during the Battle of Manhattan. He gives one half of it to the East River spirit and the other half to the Hudson River spirit in exchange for keeping Kronos' armies from entering Manhattan using the East and the Hudson rivers respectively. Despite its cleaning power, Percy notices that the pollution in each of the rivers proved to be too thick and constant to truly clean all of it away.

Abilities

They can magically clean water pollution, as shown in The Last Olympian, when Percy Jackson met both the East River spirit and the Hudson River spirit during the Battle of Manhattan.

Items
Personal Weapons: Riptide | Annabeth's Knife | Backbiter | Frank's Spear | Hazel's Spatha | Katoptris | Nico's Sword | Thalia's Spear | Aegis | Maimer | Kronos' Scythe | Ivlivs | Master Bolt | Poseidon's Trident | Sword of Hades | Reyna's Spear | Hades' Staff | Juno's Gladius | Annabeth's Sword | Sumarbrander | Mjølnir | Thor's Staff | Khopesh | Mallory's Serrated Knife | Meg's Twin Imperial Gold siccea blades
Magical Items: Annabeth's Yankees Cap | Helm of Darkness | Keys of Hades | Flying Chariot | Golden Apple | Greek Fire | Hermes' Multivitamins | Leo's Magical Toolbelt | Nectar and Ambrosia | Pandora's Pithos | Winged Shoes | The Golden Fleece | Stygian Ice Whistle | Arrow of Dodona | Serapis' Staff | Magic 8 Ball
Spoils of War: The Minotaur's Horn | Medusa's Head | Kampê's Scimitars | Nemean Lion's Pelt | Gorgon Blood | Cornucopia | Lydian Drakon Hide | Phineas' Robe and Slippers
Items: Camp Necklace | Chameleon Armor | Daedalus' Laptop | Golden drachma | Denarius | Mark of Athena | The Pax | Video Shield | Wristwatch Shield | Golden Mango | Sibylline Books
Blessed Metals: Celestial Bronze | Imperial Gold | Stygian Iron | Bone Steel