Gigas Worm is a boss that appears exclusively in Final Fantasy IV Advance and Final Fantasy IV: The Complete Collection. It guards Edward's weapon in the Cave of Trials. It uses strong physicals, and counters attacks with an attack of its own, so it can be difficult to defeat. Fortunately, if either Rosa or Porom are in the party for the fight, they can heal the party while the other party members attack. Alternatively, the player can bombard it with magic.