Nomad wraith residing in the Beyonder Crystal. She and her triumvirate, The Beyonders, were banished for eternity into the Crystal during the time of Soliam Murr. Sandra was member of the Sisters of the Arch, an order of assassins, she and eight other Sisters set out to the Downside to kill Soliam Murr and his retinue. They failed in their mission, and the Scribes, in retaliation, sealed her and the other Sisters in the Beyonder Crystal. Their purpose now is to train the Nightwings. 