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Thoon was a giant created by Gaea to oppose and destroy the Fates.


First Giant War

Thoon sided with the giants in the First Giant War. In the myth, Thoon and Agrius were clubbed to death by the Fates with maces of bronze.

The Heroes of Olympus

The Blood of Olympus

Thoon was first introduced in Piper McLean's dream by Enceladus, in response to Periboia's remarks about tempting fate. Enceladus replied that Thoon was born to kill the Three Fates, saying, "He will strangle the old ladies with his bare hands. He will shred their yarn and destroy their loom. He will destroy Fate itself!".

Later, Thoon was called upon by Porphyrion to sacrifice the captured Percy and Annabeth for Gaea. Before he could perform the deed, however, his hand was chopped off by Piper. He later faced off against Percy Jackson, somehow having managed to reattach his hand.

Thoon was bludgeoned to death by the Fates in the final battle of the Gigantomachy, after which Hades (invisible with his Helm of Darkness) opened up an abyss under the fallen giant's body, sending Thoon back to Tartarus.

The Fates clubbing Thoon and Agrius to death


  • Prowess in Battle: Despite being a rather short giant, Thoon is a very skilled warrior (fighting with a huge meat cleaver), able to hold his own against Percy Jackson himself, though he is later defeated through the combined effort of all three Fates.
  • Giant Invincibility: As a giant, Thoon can only be killed by a god and demigod working together, and when he is harmed by anybody else, he heals at an accelerated rate. Hence, he was brought down the first time around by Hercules and the three Fates, and the second time around in The Blood of Olympus by the three Fates and some of the Seven.
  • Destiny Manipulation: As the anti-Fates he has the ability to control Destiny, the opposite of Fate. This is his strongest ability.


Thoon is described as a shriveled, wizened giant, with ratty grey hair, a wrinkled face, eyes milky with cataracts and dragon-scale legs as white as frost. Instead of armor, Thoon wears a tattered sackcloth tunic. He is apparently smaller than most of the Giants, including Enceladus (who is thirty feet tall).

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
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