Solstice: Dragonfire

Puck and his friends have landed on the volcanic planet Ulderon, where the Mechanoids are searching for the Fire Crystal, which they plan to use to destroy the main characters' home planet Onyx, with assistance from Phoenix, a exile from Onyx. If he assists them, the Mechanoids shall provide weapons to him and repair his ship to get his vengeance, but the capture of the Fire Crystal is a much more pressing matter....