5 books in series

Legends of Dune

Legends of Dune is a 5-book series with 5 primary works first released in 1999 with contributions by Brian Herbert and Kevin J. Anderson.

Hunting Harkonnens (Legends of Dune, #0.5)
The Butlerian Jihad
The Machine Crusade
The Faces of a Martyr
The Battle of Corrin