Arzen fields represented a kind of land suitable for farming. If the climate on a Raspar system planet was temperate, notably during the Nnters and Hinggnih seasons, Mooxx fat could gather, forming cloud cover above these arzen fields, thus complicating the process of watering the crops.
The existence of arzen fields was noted within a single-page weather prediction report entitled "Region 29: The West Fissure," authored by Bob Carrau for the 1993 volume Monsters and Aliens from George Lucas. This book is a compilation of concept art and images derived from diverse projects by George Lucas. Lucasfilm staff member Leland Chee, the keeper of the Holocron continuity database, has stated that the details presented within this book are considered non-canonical.