Rheis Sihn is the 109 year old clan mother of the Bright Sun clan, at the rank of Sorceress. Much like the clan she leads, Rheis is a modern and liberal woman (within the boundaries of Dathomir). She is the sister of Moria Sihn, a clan mother of Raining Leaves clan that was for all intenses and purposes broken off when a male and female clan merged into what is now known as the Bright Sun clan.
Her second in command and mate is Silos Kores, a man nearly ten years younger than her at the level of a Battlemaster. Along with her mate, Rheis presides over the Bright Sun clan, supporting the Unification strongly.