5 books in series

Spelljammer: The Cloakmaster Cycle

Spelljammer: The Cloakmaster Cycle is a 5-book series with 5 released primary works first released in 1991 with contributions by David Zeb Cook, Roger E. Moore, Elaine Cunningham, Nigel Findley, and Russ T. Howard.

Beyond the Moons
The Maelstrom's Eye
The Radiant Dragon
The Broken Sphere
The Ultimate Helm