Aetherion is an experimental Celestial created by the Nedes of Skyreach while they were researching the power of nirncrux. It took the form of an ethereal Daedric Titan, a Daedric perversion of the dragon that was created by Molag Bal. Aetherion was close to immortal, and would simply condense back into a core of Aetherial energy when its corporeal form was destroyed. It was imprisoned within Skyreach Pinnacle in Hammerfell along with the lesser Celestials some time after 1E 808, when Yokudan invaders sealed the Nedic wards.
In 2E 582, the Scaled Court unsealed the ruins in their attempt to understand the Nedes' usage of nirncrux. This freed the dangerous Celestials within, forcing the cultists to retreat. The expedition leader, Mederic Vyger, subsequently left the Court and attempted to set things right. He enlisted the aid of the Vestige and re-entered the ruins to fight back against the Celestials and restore the wards. Aetherion appeared at the very end of the ritual in an attempt to stop Vyger, but the intruders destroyed his core and the wards were successfully restored.
The significance of the destruction of Aetherion Core's is unknown. As such, it is unknown if the Celestial still exists.
- Despite the fact that Aetherion was created in the early First Era, he appears as a Daedric Titan. However, some sources state that the first Titan only came into existence during the time of the Planemeld.
- For game-specific information, see the ESO article.