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Medusa, a gorgon.

Gorgon Blood is a spoil of war, left behind from killing a Gorgon. According to Stheno, blood from the right side of a Gorgon's body can heal any injury, while blood from the left side of a Gorgon's body will cause a painful death.

The Heroes of Olympus

The Son of Neptune

When Stheno and Euryale chase Percy Jackson, Stheno reveals to him that blood from their right side can heal anything, but blood from their left side is lethal. Percy manages to escape from them long enough to get to the Little Tiber. He then uses the water to rip the Gorgons apart as they are unable to reform unless connected to the earth. As their essence is washed away, Frank Zhang reaches into the river and pulls out two bottles and put them in his pocket. When Percy notices the movement, Frank gestures to him that they would speak of it later.

Later in the book, Percy decides to make a deal with Phineas. Each of them must drink from either one of the two bottles of Gorgon blood. Percy claims he is unable to tell either one apart. He relies on Gaea to trick Phineas into drinking the wrong bottle. Phineas disintegrates, whereas Percy only feels a burning in his throat and a stomach ache that quickly passes. The bottle of Gorgon blood did not return Percy's memory immediately; instead, Percy slowly regained it throughout the rest of the quest.

Items
Personal Weapons: Riptide | Annabeth's Knife | Backbiter | Frank's Spear | Hazel's Spatha | Katoptris | Nico's Sword | Thalia's Spear | Aegis | Hades' Sword | Kronos' Scythe | Ivlivs | Master Bolt | Poseidon's Trident | Reyna's Spear | Silver Bow | Hades' Staff | Juno's Gladius | Annabeth's Sword | Sumarbrander | Gungnir | Gjallar | Mjolnir | Thor's Staff | Khopesh | Mallory's Serrated Knives | Meg's Twin Imperial Gold siccae blades | Caduceus | Apollo's Golden Bow | Artemis' Knives | Ares' Sword | Ares' Shield | Thyrsus | Hecate's Torches | Minotaur's Axe | Leroy's Sword | Tyson's Javelin | Alex's Garrote Wire | Piper's Sword
Magical Items: Annabeth's Yankees Cap | Helm of Darkness | Keys of Hades | Flying Chariot | Golden Apple | Apples of Immortality | Greek Fire | Hermes' Multivitamins | Leo's Magical Toolbelt | Nectar and Ambrosia | Pandora's Pithos | Winged Shoes | Golden Fleece | Stygian Ice Whistle | Serapis' Staff | Magic 8 Ball | Arrow of Dodona | Pig Ball | Mechanical Spider | Angel Statues | Athena Parthenos | Chiron's Wheelchair | Diocletian's Scepter | Flaming Dodgeball | Gleipnir | Poseidon's Pearls | Queen Hippolyta's Belt | Mistletoe Arrow | Frank's Stick | Expand-o-Duck | Caligula's Caligae | Ran’s Net | Rune Stones | Nábrók
Spoils of War: Minotaur's Horn | Medusa's Head | Kampê's Scimitars | Nemean Lion's Pelt | Gorgon Blood | Cornucopia | Lydian Drakon Hide | Phineas' Robe and Slippers | Triptolemus's Almanac | Odysseus' Astrolabe
Items: Camp Necklace | Chameleon Armor | Daedalus' Laptop | Golden drachma | Denarius | Red Gold | Mark of Athena | Thalia's Shield | Video Shield | Wristwatch Shield | Golden Mango | Sibylline Books | Letter of Recommendation
Ships Amos' Boat | Argo II | CSS Birmingham | Egyptian Queen | Julia Drusilla Yachts | Pax | Queen Anne's Revenge | Reed Boat
Blessed Metals: Adamantine | Celestial Bronze | Imperial Gold | Stygian Iron | Bone Steel
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