After crash-landing in unknown territory; players must retrieve a magical pearl of power in order to save their homeland of Calli. O.D.T. features four playable characters; (a wizard; a female fighter; a soldier or a mercenary); each with their own unique strengths and weaknesses. Depending on which character a player selects; the gaming outcome may vary. For example; the wizard; who may not possess the maneuvering skills of the mercenary; may need to find an alternative route around an area that the mercenary could scale with ease. Likewise; a mercenary may have trouble dealing with an obstacle that requires a magical presence; in which case the wizard would be very beneficial. Features include 16 different spells; four weapons with nine power-levels each and RPG-like elements with its own player-management system; constitution; weapon control and spirit abilities.