Web of Darkness — Marion Zimmer Bradley

THE DARK MAGIC TOOK ALL SHE COULD GIVE

The young priestess Deoris abandoned all she had once loved to follow the sorceror Riveda. He was a healer, esteemed by the Temple, but he practiced the. dark arts in secret. And when his forbidden rites required her, body and soul, Deoris submitted--leaving behind her family, her religion, and her pride.

But Deoris gave Riveda more than she knew--for when her special powers joined with his, Riveda unleashed forces which would shake the foundations of their world. If Deoris could not learn how to prevent it, Atlantis would fall,