Black Belt (Final Fantasy III)

The Black Belt, also known as Karateka or Master, is a Job class in Final Fantasy III. It is gained from the Water Crystal in the NES version of the game, while it is gained from the Earth Crystal in the DS version. Black Belts are masters of combat, able to use only their fists for massive damage. They are capable of linking their mind and body to store energy for an upcoming strike. Black Belt is considered to be a powered up version of the Monk job and one of the most powerful jobs in the game.

NES version
Storing up energy, the Black Belt will be able to do more damage, with the damage increasing even more if they are bare-handed. Using the command twice boosts the attack even more, but using it three times will hurt the Black Belt and release all the built-up energy.
 * Special Ability - BuildUp

DS version
Just like the NES version, Boost will increase the Black Belt's power, but hurt them if they use it three times and cancel the energy stored up.
 * Special Ability - Boost

Under the right circumstances, it is possible for a Black Belt to defeat Cloud of Darkness in a single hit.