Source: Classic Treasures Revisited, pg(s). 40
Mara Ytrellian is a member of the trans-planar organization known as the Riftwardens. She is said to reside in Galisemni, the City of the Celestial and the Damned, located in the Borderlands of the Maelstrom. She is known to be somewhat of an authority of the magical artifacts known as spheres of annihilation.