List of characters in the Camp Half-Blood series
Deimos - The God of Terror and the son of Ares. He appears in "Percy Jackson and the Stolen Chariot" in The Demigod Files. Deimos and his brother Phobos steal Ares' war chariot from Clarisse. Percy and Clarisse have to get it back to Ares before sunset. On the way, Deimos comes in front of the ferry that Percy and Clarisse are on while riding a sea serpent. He comes back later in the zoo, terrorizing Clarisse by shape-shifting into Ares and yelling at her. Clarisse deduces his true identity and defeats him.