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Argentum is one of Reyna's automaton guard dogs, along with Aurum. Argentum is the silver hound, as his name means 'silver' in Latin, and he has eyes made of rubies. Both of the dogs have the ability to know when a person is lying and will then attack the person.

The Heroes of Olympus[]

The Son of Neptune[]

Principia inside GN

In the graphic novel

While not having a large role in the book, Argentum and Aurum follow Reyna both times she talks to Percy alone. They seem to dislike Percy Jackson greatly, growling at him almost the entire time they are in the same room as him. Reyna warns him that they will attack if she wishes it, or if he steals anything. She also warns that they can tell when people don't tell the truth and that they hate liars.

The Mark of Athena[]

Aurum and Argentum appear with Reyna when she talks with Annabeth near the beginning of the book, and also when Reyna confronts Annabeth later in the book, at Charleston.

The House of Hades[]

Argentum and Aurum appear with Reyna when is confronted by Rachel Elizabeth Dare and Grover Underwood. The dogs follow her when she confronts the Argo II crew at the House of Hades and later when she goes on her Quest to Return the Athena Parthenos with Nico di Angelo and Gleeson Hedge.

The Blood of Olympus[]

Argentum is summoned along with Aurum while Reyna, Nico, and Coach Hedge are in Pompeii. When Gaea possesses Coach Hedge and encases summoned ghosts in ash, Argentum joins the fight but is immediately hit by one of the ghosts. When he gets up, his head is "twisted forty-five degrees to the right" and one of his eyes is missing. At some point in the fight, Aurum, along with Argentum, disappear. Reyna presumes this may be because they took too much damage to fight anymore.

Reyna summons both dogs again after they arrive in Évora, Portugal. A few days later, Lycaon and his pack of wolves attack the group. The wolves are only vulnerable to fire and silver, so Argentum, with his head still twisted sideways and missing an eye, was still able to bring them down. While Nico, Reyna, and Coach Hedge were making their escape, both dogs disappeared again.

Argentum is summoned along with Aurum in San Juan, Puerto Rico. After the fight with Lycaon, even Aurum looked worse for wear. They are placed on guard duty. When Reyna gets worked up over being back in San Juan, Aurum and Argentum pick up on it and begin pacing. Argentum keeps trying to compensate for his only eye and twisted head by turning in circles. After Reyna is knocked out by a dart from the Hunters of Artemis, Aurum and Argentum are deactivated by unknown means, but not dismissed. Reyna, Aurum, and Argentum are taken to the Amazon's secret base, and both dogs are repaired by the Amazons.

In Buford, Georgia, Aurum and Argentum are seen playing with a ball. Nico notes that while they're "frisky and full of energy", it's the opposite of Reyna. Both dogs stop playing and run to Reyna's side when Bryce Lawrence attacks their group. Hedge accidentally steps over a mass grave lined with stones, and multiple skeletons emerge and surround them. When Bryce uses his power over those who break their oaths to control the undead and make them attack Reyna, Aurum and Argentum try to defend her but have their muzzles clamped shut by some of the attackers. When Bryce taunts Reyna, Nico's rage and his powers overwhelmed both dogs, and they "turned in circles, as if their mechanical brains had short-circuited."

Between the Series[]

Camp Jupiter Classified: A Probatio's Journal[]

When Claudia, a probatio in the Fourth Cohort, emerges from a secret passageway in the daughter of Bellona's office, he and Aurum nearly attack the legacy of Mercury. A couple of weeks later, he and Aurum join Reyna in tailing the legacy of Mercury.

The Trials of Apollo[]

The Tyrant's Tomb[]

He and Aurum are seen in the praetor meeting room where they are feed jellybeans by Meg McCaffrey.

The following day he and Aurum join the quest and happy jump into the bed of the pickup truck. When they arrive the two follow Meg into the foliage. They stare as Reyna laughs at Apollo’s romantic proposal and later catch ravens at the base of Sutro Tower. After the daughter of Bellona is injured in a fall the two stand guard and leave as she is carried away when Lavinia Asimov has a satyr knock her out to heal.

Both pets are seen for the last time accompanying Reyna and the rest of the hunters leaving the camp in search of the Thaumesian Fox.

Gallery[]

Trivia[]

  • Argentum is the only automaton in both series to be made of silver.
  • Argentum and its counterpart, Aurum, may have been modeled after King Alcinous's gold and silver guard dogs, mentioned in Book Eight of The Odyssey.
  • Argentum is not considered a weapon, as he is allowed to enter New Rome, but as Annabeth noticed, Argentum and Aurum could easily tear her apart with their sharp metal teeth.
Items
Personal Weapons: Riptide | Annabeth's Knife | Backbiter | Master Bolt | Poseidon's Trident | Nico's Sword | Thalia's Spear | Aegis | Ares' Sword | Ares' Shield | Caduceus | Apollo's Golden Bow | Silver Bow | Artemis' Knives | Hades' Sword | Hades' Staff | Kronos' Scythe | Ivlivs | Katoptris | Hazel's Spatha | Frank's Spear | Reyna's Spear | Juno's Gladius | Annabeth's Sword | Sumarbrander | Gungnir | Gjallar | Mjolnir | Gríðarvölr | Khopesh | Mallory's Serrated Knives | Meg's Twin Imperial Gold siccae blades | 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 | Pandora's Pithos | Winged Shoes | Golden Fleece | Flying Chariot | Golden Apple | Apples of Immortality | Greek Fire | Hermes' Multivitamins | Nectar and Ambrosia | Stygian Ice Whistle | Keys of Hades | Leo's Magical Toolbelt | 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 | Pomegranate
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 | Naglfar | Gorgyra's Canoe
Blessed Metals: Adamantine | Celestial Bronze | Imperial Gold | Stygian Iron | Bone Steel
The Heroes of Olympus
Core Series: The Lost Hero | The Son of Neptune | The Mark of Athena | The House of Hades | The Blood of Olympus
Main Characters: Jason Grace | Piper McLean | Leo Valdez | Percy Jackson | Frank Zhang | Hazel Levesque | Annabeth Chase | Iapetus/Bob | Reyna Ramírez-Arellano | Nico di Angelo | Gleeson Hedge
Secondary Characters: Hylla Ramírez-Arellano | Dakota | Tyson | Ella | Octavian | Halcyon Green | Dr. Howard Claymore | Alabaster C. Torrington | Lamia
Minor Characters: Rachel Elizabeth Dare | Grover Underwood | Thalia Grace | Clarisse La Rue | Fleecy | Mrs. O'Leary | Kinzie | Arion | Calypso | Lou Ellen Blackstone | Chiron | Will Solace | Tristan McLean | Don | Julia | Jacob | Michael Varus | Burly Black | Medea | Midas | Lityerses | Phineas | Otrera | Echo | Narcissus | Sciron | Pasiphaë | Lycaon
Olympian Gods: Zeus | Hera | Poseidon | Hades | Ares | Demeter | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus
Minor Gods: Achelous | Aeolus | Asclepius | Boreas | Eurus | Hecate | Iris | Hypnos | Keto | Khione | Kymopoleia | Mithras | Nemesis | Nike | Notus | Phorcys | Serapis | Thanatos | Triptolemus | Zephyros
Roman Gods: Jupiter | Juno | Neptune | Pluto | Mars | Minerva | Ceres | Lupa | Bellona | Fortuna | Janus | Terminus | Vulcan | Mercury | Apollo (Roman) | Diana | Venus | Bacchus | Pomona | Aquilon | Hercules | Cupid | Auster | Favonius | Letus | Victoria
Giants: Enceladus | Porphyrion | Alcyoneus | Polybotes | Ephialtes | Otis | Damasen | Clytius | Mimas | Orion | Hippolytos | Thoon | Periboia
Undead: Gray | Zombie
Primordial Gods: Gaea | Tartarus | Ourae | Nyx | Chaos | Ouranos | Akhlys | Hemera | Elpis | Spes
Monsters and Magical Creatures: Cynocephali | Gorgon | Gryphon | Harpy | Basilisk | Lycanthrope | Gegeines | Cyclops | Katobleps | Unicorn | Giant Eagle | Ichthyocentaur | Satyr/Faun | Storm Spirit | Laistrygonian Giant | Lares
Related Content: Rick Riordan | Haley Riordan | Percy Jackson and the Olympians | Percy Jackson and the Olympians: The Ultimate Guide | The Demigod Files | The Demigod Diaries | The Son of Sobek | The Singer of Apollo | The Staff of Serapis | Percy Jackson's Greek Gods | Percy Jackson's Greek Heroes | The Crown of Ptolemy | Demigods & Magicians | Demigods of Olympus | Percy Jackson Demigod Collection
The Trials of Apollo
Core Series: The Hidden Oracle | The Dark Prophecy | The Burning Maze | The Tyrant's Tomb | The Tower of Nero
Main Characters: Apollo/Lester Papadopolous | Meg McCaffrey | Percy Jackson | Peaches | Leo Valdez | Calypso | Grover Underwood | Piper McLean | Jason Grace | Reyna Ramírez-Arellano | Frank Zhang | Hazel Levesque | Lavinia Asimov | Nico di Angelo | Will Solace | Rachel Elizabeth Dare
Secondary Characters: Chiron | Austin Lake | Kayla Knowles | Hemithea | Josephine | Georgina | Lityerses | Trophonius | Gleeson Hedge | Mellie | Chuck Hedge | Medea | Herophile | Crest | Don | Tyson | Ella | Tarquin | Luguselwa | Claudia | Janice | Blaise
Minor Characters: Sally Jackson | Thalia Grace | Mrs. O'Leary | Festus | Cade | Mikey | Harley | Connor Stoll | Miranda Gardiner | Cecil Markowitz | Ellis Wakefield | Sherman Yang | Damien White | Malcolm Pace | Paolo Montes | Valentina Diaz | Germani | Agamethus | Olujime | Phillip McCaffrey | Hunter Kowalski | Sssssarah | Prickly Pear | Aloe Vera | Joshua | Naevius Sutorius Macro | Incitatus | Tristan McLean | Bombilo | Aurum | Argentum | Julia | Jacob | Dakota | Poison Oak | Screech-Bling | Annabeth Chase | Elon | Mamurius Veturius | Mimi
Olympian Gods (Greek & Roman): Zeus/Jupiter | Hera/Juno | Poseidon/Neptune | Demeter/Ceres | Ares/Mars | Athena/Minerva | Apollo/Apollo (Roman) | Artemis/Diana | Hephaestus/Vulcan | Aphrodite/Venus | Hermes/Mercury | Dionysus/Bacchus | Hades/Pluto
Minor Gods: Nero | Commodus | Caligula | Iris | Britomartis | Styx | Terminus | Lupa | Terpsichore | Harpocrates | Cardea
Titans: Rhea | Leto | Mnemosyne | Helios
Monsters and Magical Creatures: Python | Nosoi | Karpos | Palikos | Myrmekes | Colossus Neronis | Blemmyae | Gryphon | Carthaginian Serpent | Scythian Dracaena | Cynocephali | Centaur | Cyclops | Yale | Satyr/Faun | Strix | Dryad | Dragon | Pandai | Eurynomos | Skeleton Warriors | Vrykolakai | Khromandae | Amphisbaena | Troglodyte | Tauri Sylvestres
Related Content: Rick Riordan | Percy Jackson and the Olympians | The Heroes of Olympus | Demigods & Magicians | Camp Half-Blood Confidential | Camp Jupiter Classified: A Probatio's Journal | Percy Jackson Demigod Collection | Un Natale Mezzosangue | The Sun and the Star: A Nico di Angelo Adventure
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