There are 3 books in the Witch World - The Turning series. The newest book is On Wings of Magic which came out in 1994.

1
Storms of Victory

By Andre Norton , P. M. Griffin,

Book cover of Storms of Victory
In the wake of their defeat of Pagin of Karsten, the Witches of Estcarp await news of those who have been lost or missing since the battle, and a young Sulcar woman awakens to her Power only to do battle with an ancient evil. Reprint.
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2
Flight of Vengeance

By Andre Norton , P. M. Griffin, Mary Schaub

Flight of Vengeance
A witch whose powers are temporarily suspended recounts the tale of a massive witch-powered cataclysm called "The Turning," describing the event and its consequences for the Witch World

3
On Wings of Magic

By Andre Norton , Sasha Miller, Patricia Mathews

On Wings of Magic
While the Falconer women of Eastcarp endure personal betrayal to rebuild their lives after the havoc of the Turning, six young girls--a new generation of witches--escape imprisonment in an Alizon stronghold