Enduriel was an elven Dragon Rider, bonded to a Dragon of unknown color, who joined Galbatorix and became one of the Forsworn. Ajihad was the steward of his chief estate before he escaped. Galbatorix said that Enduriel was not particularly intelligent and that His Dragon was rather more cunning than Enduriel was himself.
Since Enduriel has not made a physical appearance in the books, the extent of his powers cannot be certain. It is likely that he was very skilled at swordplay, mental powers and magic, since he was a Dragon Rider and slew many others of the order. He also learned dark magic from Galbatorix and possibly drew power from some Eldunarí he captured during the fall of the riders. Paolini stated that Galbatorix eventually gathered most if not all of the Forsworn's Eldunarí for himself, so Enduriel's power probably lessened since the Riders’ Fall.
- According to Galbatorix, Enduriel's Dragon was more cunning than his Rider, yet after the banishing of the names their dragons became little more than beasts, so it is unknown how he coped with losing his more intelligent partner, possible going mad which could have led to him being lax with controlling Ajihad.