This page is all about the Arlia planet on DBE:

This is the home to the warrior arlians. Arlia is a very small planet covered in deserts and caves. In the center of the planet is Meta Mantis City, the only place of commerce and socializing. The vast deserts hide the many ruins under the sand and give home to the legendary dragons. Many secrets lie within the red and white sands of Arlia. Areas of interest are Ruined Arlian Palace, Life Shrine, Bio Division, Ukime Desert and Inago Valley.