Skells (from the word exoskeleton) rely on fuel to power them, and can be used in battle at any time, mostly against larger creatures. After finishing Chapter 6 of the main plot, the Skell License Certification Test may be passed and obtained. Upon passing the test, a weaponisable Skell can be obtained, which can be used to assist in exploration and battles throughout Planet Mira. After obtaining the first Skell, any playable character will also be allowed to pilot a Skell, provided they meet the minimum level requirements for their particular Skell. In addition, after Chapter 9 and a successful development, the Flight Module can be obtained, allowing the Skell to fly through Mira's sky. A significant range of actions will then be accessible, and numerous locations can be reached via flight.