White Dragon, also known as Pale Dim, WhiteDragon, or White D., is an optional boss in Final Fantasy IV. It guards the Murasame, Edge's second most powerful weapon in the original releases, on the third-floor basement of the Lunar Subterrane.
The White Dragon counters all physical attacks with Slow and all magical attacks with Earthquake. If the player casts Float on the party before the battle, Earthquake will miss, otherwise it will inflict around 700 damage to all party members. The White Dragon also possesses a strong physical attack and Maelstrom, which reduces all party members' HP to single digits. The player can avoid these attacks by spacing out the character's turns, as counters will reset the White Dragon's ATB gauge.
In the Nintendo DS version, White Dragon will counter all attacks directed against it with Slow, and uses Earthquake as a standard ability.