The second form glitch is a glitch in 2D versions of Final Fantasy IV where a player can prevent certain bosses from entering their second forms during a fight. The glitch works because the transformation is a counter, but will never trigger if a spell is reflected off a character onto the boss. The first boss susceptible to this tactic is the MomBomb fought at Mt. Hobs. The Elements fought in the Giant of Babil are vulnerable; in essence, one only has to kill Milon, who has about 20,000 HP. The Dark Elf, fought in Cave Magnes, and Zeromus, who only has 61,000 HP, can also be prevented from entering their second forms.