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Characters / The Camp Half-Blood Series Monsters

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The various monsters seen in The Camp Half-Blood Series (Percy Jackson and the Olympians, The Heroes of Olympus and The Trials of Apollo). Please note that not all monsters are evil. For the full list of characters, click here.

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The giant children of Gaea and Tartarus, each one was meant to destroy and replace a specific god. They appear in The Heroes of Olympus.
  • Arch-Enemy: Each one was designed to destroy a specific god.
  • Back for the Finale: Come back regenerated and just as ready to destroy the demigods as ever in The Blood of Olympus. Of course, now that Reyna and Nico manage to unite the warring camps and cure the gods' schizophrenia, they are disposed of fairly easily.
  • Eviler Than Thou: The gods and Titans are not saints and it is sometimes hard to see a difference between them. However, everyone agrees the giants are worse than both. Being children of the Greek version of Hell it is to be expected.
  • Evil Knockoff: Of the Olympians
  • Final Boss: In the first three books, quests to defeat the giants drive much of the plot — Porphyrion for the first, Alyconeus for the second, and Enceladus for the third. While not an official quest, Hazel's battle with Clytius fulfills this role for the fourth. And, of course, the fifth book deals with all of them.
  • Gaia's Vengeance: They are it.
  • Implacable Man: Their primary strength. They lack the vast magic possessed by the gods, but are designed to keep coming no matter what thanks to only being able to be killed by a god and demigod working together.
  • Our Giants Are Bigger: The average giant or giant-sized monsters are around 10-12 feet tall. These giants are around 20 feet or more.
  • Pride: A flaw shared by all of them and according to Nemesis they have more pride than the Olympians or Titans which is saying something. Each one thinks they are invincible in battle and can surely defeat the Olympians despite having lost before and individual giants being defeated by individual demigods. This causes them to severely underestimate their enemies leading to one humiliating defeat after another.

The Giant counterpart to Ares. As Ares is warlike and bloodthirsty, Damasen is peace-loving and gentle. This put him at odds with the rest of his family, who exiled him in Tartarus. By the time our heroes encounter him, he has become bitter, but they find ways around that.
  • Arch-Enemy: He was designed to be one to Ares, but this backfired because, by being the opposite of a violent war god, Damasen is by default a pacifist without desire to actually fight.
  • Antagonistic Offspring: To Gaea and Tartarus, whose crusade he refused to take part in.
  • The Beastmaster: He tames and rides the Drakon at the end of the fourth book. It certainly wasn't on good terms with him before, so it's likely he was exerting some kind of magical control over it... or it might have just been as eager to break their endless cycle of fighting as Damasen was.
  • Big Damn Heroes: Appears during the fight with Tartarus to help Bob hold him off.
  • Cynicism Catalyst: Inverted. Seeing the formerly brutal Iapetus rebel against Gaea convinced him that he, too, could change his fate.
  • Dragon Rider: During his Big Damn Heroes moment, he rides on the back of the same drakon he fought for thousands of years.
  • The Exile: He was trapped in Tartarus for eternity after a rather drastic falling out with the other Giants.
  • Fate Worse than Death: He was exiled in Tartarus for thousands and thousands of years, forever locked in combat with the Maeonian Drakon.
  • Hair Decorations: Like the other Giants, but instead of trophies of war, he has grass, leaves and flowers braided in it, reflecting his peaceful nature.
  • Heroic Sacrifice: He takes on Tartarus to buy Annabeth and Percy time to escape.
  • Let's Get Dangerous!: He delivers an awesome speech to this effect whilst battling Tartarus.
    Damasen: Father, you wished for a more worthy opponent? I am one of the Giants you are so proud of. You wished me to be more warlike? Perhaps I will start by destroying you!
  • The Medic: He cures Percy of his gorgon-blood poisoning.
  • Nice Guy: Because Ares was such a Blood Knight, Damasen ended up being this. His temperament seems to have soured somewhat in the present day, but really, can you blame him?
  • No Good Deed Goes Unpunished: The other Giants exiled him to Tartarus for ending the Drakon's rampage through Maeonia (present-day Turkey).
  • Red Is Heroic: He has rust-colored hair and cherry-red skin, and is the most morally upright and benevolent of the Giants.
  • Token Good Teammate: To the Giants; he's the only one of their kind to have no interest in war and conquest.
  • You Can't Fight Fate: He initially believes this, but Percy and Annabeth change his mind.
  • You Shall Not Pass!: He does this against Tartarus, allowing Percy and Annabeth to escape through the Doors of Death.



A cyclops (plural cyclopes) is a one eyed giant. The first ones were born from Gaea and Ouranos, though the majority of them are children of Poseidon. Many cyclopes work for the gods, either by being in their army or the forges of Hephaestus. The rest prefer to prey on wandering Demigods.
  • Beware the Silly Ones: Their stupidity can often end up being pretty funny, but they're still dangerous, man-eating monsters.
  • Cyclops: Of course.
  • Dumb Muscle: Unless they're working with metal, they are this.
  • Genius Ditz: They excellent with metal, in fact the first three cyclopes made the big three's symbols of power.
  • Gonk: Most people consider them pretty ugly.
  • Immortality: A standard for monsters, killing them just sends them to Tartarus were they'll just reform.
  • Super Senses: Super hearing, it's often used in tandem with Voice Changeling, in order to help draw in unsuspecting demigods.
  • Super Strength: All of them have it to some degree.
  • Voice Changeling: All cyclops have this power and it's creepy.

The infamous cyclops that was blinded by Odysseus from The Odyssey. At some point he acquired the Golden Fleece, which attracted numerous satyrs to his Island and their demise. The heroes Percy, Annabeth, Grover and Clarisse eventually went on a quest to steal the fleece from Polyphemus to save Thalia's Tree and all of Camp Half-Blood.
  • Berserk Button: The mention of "Nobody".
  • Blind Mistake: Mistakes Grover for a female cyclops and tries to marry him.
  • Evil Cripple: Tricks numerous satyrs into coming to his Island to eat them and later on tries to eat the heroes of the story. He also tries to force Clarisse into marrying him. He also takes abuses the mercy Percy gave him.
  • Handicapped Badass: Fights the heroes of the story and almost won.
  • Pride: Arrogantly believes that Poseidon will help him kill Percy due to being his son.
  • Temporary Blindness: Zig Zagged; sometimes he appears to be blind, but at other times he can (abit with much difficulty).



Three sisters that were turned into hideous monsters by the goddess Athena after she caught Medusa having a affair with the god Poseidon.


Played by: Uma Thurman
The youngest of the gorgon sisters. She was once a beautiful priestess of Athena, but was seduced by Poseidon in Athena's temple as payback for turning Coronis into a raven. Enraged by the desecration of her temple cursed Medusa, and her sisters for trying to hide it. She actually seems to have some sort of affection for Poseidon though even after being cursed as seen with her being kind to Percy, even though she still attempted to turn him into a statue so she can keep him forever. She is the mother of both Pegasus and Chrysaor.


Technically not really monsters, but robots only more developed (likely due to magic). Despite this they are often treated as monsters due to how dangerous they can become if they are broken or activated incorrectly. Not to mention many were built for combat. They can also be used as vessels for souls and other bodiless spirits, such as Daedalus and Eidolons have shown. Many were built by Hephaestus.
  • Annoying Arrows: Arrows rarely if ever affect them since they're made out of metal.
  • Clockwork Creature: Those described in more detailed are described as such, possible meaning that they all are.
  • Nigh-Invulnerability: Normal attacks rarely work on them since they're made of metal.
  • Steampunk: In combination with Clockwork Creatures above, though instead of a Victorian flavor it's usually Greek or Roman if not the society it was built in.


Formed from animal, bronze and ghosts with the use of dark magic. They feed on the blood of young men and they posses flaming hair, white skin, red eyes, fangs, one prosthetic bronze leg and one donkey leg. They claim to be the basis for the vampire legend.

A blonde empousa who attacked Percy while seducing and feeding on students. She was Kelli's student, but unlike her mentor she has yet to reform after her death.
"I said something really intelligent like, 'Uhhh?'"

One of many empousai that were following Kelli in Tartarus to get to the Doors Of Death in order to get back to the mortal world. She was eventually killed by Kelli when she tried to take control of their group after finding out that Hecate sided with the Olympians.
  • The Older Immortal: She refers to Kelli as "young one", despite Kelli being at least a thousand years old.
  • Undying Loyalty: To Hecate; she refuses to remain on the Giants' side when she finds out Hecate is siding with Olympus, and fights Kelli to the death over this.
  • We Hardly Knew Ye: She has a total of six lines before she's killed.


Large monster dogs from The Underworld. They are highly feared by half-bloods, but are relatively safe for children of Hades/Pluto. For the only known friendly hellhound Mrs. O'Leary go here.

A child of Gaia and Tartarus. He was created to avenge the defeat of the Titans, but was defeated and imprisoned in Tartarus. Released in modern times by Percy on accident. He once again tries to destroy the gods and serves as a distraction for Kronos.
  • The Dreaded: He's feared by the Olympians more than any other threat, even Kronos.
  • Eldritch Abomination: More so than anyone else. His body is constantly shifting between every type of monster and new ones and looking at him for too long would drive a demigod insane.
  • Father Of A Thousand Young: He fathered nearly all of the major monsters.
  • The Juggernaut: It took the combined might of most of the major Olympians battling him for weeks and the last minute arrival of Poseidon and his own army to bring him down. When he first showed up to battle the Olympians in ancient times, every god except Zeus ran at the sight of him.
  • Laser-Guided Tyke-Bomb: Created to avenge the Titans' defeat and bring down the Olympians.


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