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Besides, I love terror. I live on terror!

–Deimos to Percy Jackson, in The Stolen Chariot

Deimos is the Greek god of terror, panic and dread. His twin brother is Phobos. They are known for accompanying Ares into battle. His Roman counterpart is Metus or Formido.


Early life

Ares, his father.

Phobos was born to Ares and Aphrodite

Along with his twin brother Deimos, Phobos would often accompanies Ares in battle.

Trojan War

During the fall of Troy, Phobos inflicted bloodshed and terror in the war with Phobos, his aunt Enyo, and ErisAchilles later depicted the aforementioned gods in his shield.

Percy Jackson and the Olympians

The Demigod Files

The Stolen Chariot

Angry that their sister Clarisse La Rue was allowed to ride in Ares' chariot because they usually use the chariot, Phobos and Deimos decide to steal it from her. They then hide it in the Staten Island Zoo, and use it as bait to catch their sister and Percy Jackson.

Deimos fights Percy but is defeated and disappeared. Deimos changed his appearance to match Ares in order to scare Clarisse, but he disappeared again after she overcame her fear. 

The Heroes of Olympus

The Blood of Olympus

While underground in Phobos's and Deimos's temple, Piper McLean and Annabeth Chase fight the giant Mimas. Piper sacrifices her cornucopia to her brothers. After Mimas's defeat, the face of Deimos on the wall falls onto the giant, killing him. As only a god and demigod together can kill a giant, presumably Deimos caused this to happen to kill Mimas. Then Piper thanks her brothers, and requests a way out of the cave. Phobos opens up a tunnel for them to get back to the surface along his twin.


Deimos is known to be more aggressive than his brother, Phobos.

Despite his cold behavior towards Clarisse, Deimos isn't all that bad, as he accepted his other half-sister Piper's request for help. However, this could be because Piper is a child of his mother, and so he isn't as agressive with her as he would be with a child of Ares.


Deimos is described as a muscular teenage boy with a brutal face covered with scars. He is dressed in jeans, a black shirt, and a leather jacket.


Deimos has the standard powers of a god.

  • Odikinesis: As the God of Terror, Panic and Dread, Deimos can control the feelings and emotions of war, such as fear, hate and rage.
    • Terror Generation: Deimos has the ability to bring terror to a large crowd. In The Demigod Files, he brings a large sea monster that scares many mortals.
  • Teleportation: Deimos can vanish to other locations.
  • Cult Jurisdiction: Deimos has control over objects which represents him. In The Blood of Olympus, he was able to bring a statue of himself down upon Mimas without being physically present.
  • Shapeshifting: As a god, Deimos can change his appearance and form. In The Demigod Files, he changed his appearance to look like his father.
  • Swordsmanship: Deimos is a sword fighter. Despite of being a son of a war god, he is a terrible physical combatant likely because he never had to rely on his skill and thus never trained.


Aphrodite, his mother.

  • His alternate name is Deimus.
  • When questioned about the difference between the two it was stated Phobos typically acts on one person at a time and makes it more personal and specific while Deimos acts on a larger scale, such as whole crowds.
  • Deimos, the smaller of the two moons of Mars, is named after this deity.​
Percy Jackson and the Olympians
Core Series: The Lightning Thief | The Sea of Monsters | The Titan's Curse | The Battle of the Labyrinth | The Last Olympian
Main Characters: Percy Jackson | Grover Underwood | Annabeth Chase | Tyson | Clarisse La Rue | Thalia Grace | Nico di Angelo | Chiron | Luke Castellan | Rachel Elizabeth Dare
Secondary Characters: Sally Jackson | Travis Stoll | Connor Stoll | Mrs. O'Leary | Silena Beauregard | Charles Beckendorf | Paul Blofis | Blackjack | Zoë Nightshade | Bianca di Angelo | Juniper | Ethan Nakamura
Minor Characters: Gabe Ugliano | Frederick Chase | Michael Yew | May Castellan | Austin Lake | Kayla Knowles | Maria di Angelo | Will Solace
Olympian Gods: Zeus | Hera | Poseidon | Demeter | Ares | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus | Hades | Hestia
Minor Gods: Amphitrite | Ariadne | Hecate | Iris | Janus | Morpheus | Nemesis | Pan | Persephone | Triton
Titans: Kronos | Atlas | Calypso | Iapetus | Krios | Hyperion | Oceanus | Prometheus
Related Content: Rick Riordan | The Lightning Thief (film) | Sea of Monsters (film) | The Demigod Files | Demigods and Monsters | The Ultimate Guide | The Heroes of Olympus | The Trials of Apollo | Disney+ Series