3 books in series

Witch World Series 4: Secrets of the Witch World

Witch World Series 4: Secrets of the Witch World is a 3-book series with 3 primary works first released in 1995 with contributions by Andre Norton, Lyn McConchie, and Mary H. Schaub.

The Key of the Keplian
The Magestone
The Warding of Witch World