A disillusioned Sidhe who previously had joined the rebels in Hadreon. In that life, they'd lost faith in the Sidhe Courts and believed them to be harmful to the goals of the Sidhe race. Once the waygates were revealed to be active, they'd seen their chance and had escaped to Hadreon where they thought they'd be safer to plan against the Courts. They trusted only those within their immediate circle, but were suspicious of anyone else. Other Sidhe were considered enemies until proven otherwise.

Eventually, after the ship they rebels had relocated to, the Avalon, crash landed Ceridwen lost faith in the rebellion as well and succumed to corruption. They were taken out by one of the officers, Fiona, and have since been reborn into a new life with no memories of any of this.