The White Dragon, also known as the Dragon or the W.Dragon, is the first of four elemental dragon-type bosses that can be found guarding various chests in some of the later dungeons of Final Fantasy II. This Ice-type dragon is found in the Mysidian Tower hiding in a treasure chest that contains the Black Robe armor. Later it may appear again as a random encounter in the lower levels of the Jade Passage.
The White Dragon ultimately acts like a more vicious Ice Gigas, with a few hundred more HP and a higher Attack stat. He attacks physically and pounds the party with Icestorm XVI. The beast is weak to Blind.
The long trek up the Tower of Mysidia may leave the party in an unfavorable state, so it may be a blessing that this is only an optional boss fight. Players are best attempting to challenge the White Dragon if the party came out of the Thunder Gigas with plenty of HP and MP intact. Equipping the Fire-based weapons found on the first couple floors of the tower exploits White Dragon's elemental weakness.