Deetsan is an Argonian mage. Holding the rank of Magician, she is a member of the Cheydinhal Mages Guild during the final years of the Third Era. She is skilled in Alteration and can train others in its use up the novice-level. Deetsan is connected with the Cheydinhal Recommendation quest, helping the Hero by giving them the Buoyancy spell for free. After events involving the Hero of Kvatch's role as an Associate of the guild, she becomes the leader of Cheydinhal division after Falcar is ousted as a Necromancer and is exiled from the guild. Deetsan is considered the most caring of the Cheydinhal mages, and is very friendly to new Associates.
Most of the people of Cheydinhal observed that they'd never seen a mage as happy to be in the guild as Deetsan, though she came off as a bit insecure. This insecurity came to light while working under Falcar, the head of the Cheydinhal guild. Falcar, seemingly acting out of sheer cruelty, gave Vidkun, an Associate of the guild, the task of retrieving a Ring of Burden from the Mages Guild Well. He left to do the task, and promptly vanished into thin air.
Deetsan, who had liked Vidkun, worried over him, but refrained from saying anything until Falcar gave the same task to the individual who would later become the Champion of the Mages Guild, in exchange for a recommendation to the Arcane University. Thanks to her intervention, providing the Champion with a spell that combined Water Breathing with a mild Feather effect, they survived. But when she told Falcar she had helped the new Associate and threatened to report him to the Council of Mages, he flew into a rage and stormed out, saying the Guild's days were numbered.
Upon the return of the Champion from the task, Deetsan apologized profusely for her role in Falcar's disappearance, and hopefully suggested the Champion might find a recommendation in Falcar's room. When the Champion's investigation turned up no recommendation, but instead a pair of black soul gems, Deetsan took the initiative, writing a report to the council and include the Champion's recommendation herself. As a result of this, when the Council formally expelled Falcar, Deetsan was promoted to head of the Cheydinhal branch.
- Some of the citizens in Cheydinhal will often refer to Deetsan as male.