Esras Castien was a 24th century musician from Centaurus. In the 2380s, he was a member of the group Subspace Domain. Born in the city of Oreas in 2352, he was the third son of Sherai and Abaras Castien, and the twin brother of Eli. (Star Trek: Pendragon: "Where the Silence Breaks", "The Acolytes", "Faith My Eyes"; Star Trek: Distant Realm RPG)