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Thalia Grace who owns the shield.

Thalia's Shield is a replica of Aegis owned and used by Thalia Grace, the daughter of Zeus and the lieutenant of the Hunters of Artemis. It was found by Luke Castellan in the house of Halcyon Green. Thalia typically pairs it up with her spear.

Description

It is often simply referred to as Aegis despite only being a replica. When not in active use, the shield takes on the form of a bracelet that is activated by the user tapping it and saying "Aegis." Like the real Aegis, it has the face of Medusa on the front, but as it is not the real Medusa's face, it does not have the power to turn others to stone. However, as a result, it tends to be frightening to enemies and has an aura that sends monsters running away in fear. It has shown to be extremely durable, more so than ordinary shields. This was shown when Thalia and Percy were battling the Manticore and defended against the monster's missile spikes. It held up without a single scratch while Percy's Wristwatch Shield was heavily damaged and dented.

History

At some point before Halcyon Green was born, the shield was locked in a cursed safe in his childhood home. After Halcyon was cursed by Apollo for using his prophetic abilities to tell a young girl the future, many demigods would visit his house in search of the treasure within, but would be killed by the safe's defenses or the leucrotae.

The Demigod Diaries

The Diary of Luke Castellan

Luke Castellan and Thalia Grace are led to Halcyon Green's house by Amaltheia where they become trapped. Hal leads the two to the safe, having believed that they were another treasure seeker after the contents. Using his powers as the son of Hermes, Luke is able to safely open the safe and retrieve the bracelet which Thalia believes Zeus had purposefully led her to. After remembering the story of Aegis, Luke suspects that Amaltheia, bitter after being skinned by Zeus and then reforming from Tartarus, had led them to the house to kill them in revenge for Zeus' actions. However, Thalia can't figure out how to activate the shield.

Later, as Hal destroys the house with Greek Fire, a surviving leucrotae attacks Luke and Thalia. Remembering the story surrounding Amaltheia and Aegis, Luke has her tap the bracelet and call out Aegis. The shield activates and when Thalia turns the representation of Medusa on it towards the monster, the leucroate is so frightened that it backs into the house's deadly drapes which consume and destroy it. After escaping from the house, Thalia returns her shield and spear to their deactivated forms.

Percy Jackson and the Olympians

The Titan's Curse

Thalia uses the shield in battle against Dr. Thorn, the Manticore.

The Last Olympian

Thalia wields the shield during the Battle of Manhattan.

The Trials of Apollo

The Dark Prophecy

Thalia uses her shield in battle against the forces of Commodus. After seeing the face of Medusa on the shield, Apollo realizes that it's not the original Medusa as that would turn him to stone, but the replica is so good that it scares Commodus' Germani into cowering away.

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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