Blinds all foes with darkness.
Dark (ダクネス, Dakunesu?, lit. Darkness), also known as DARK in the NES release and Fog in the Final Fantasy Origins release, is a Level 2 Black Magic spell which attempts to inflict Blind on all enemies. It has a relatively low success rate, but unlike the Blind spell can only be resisted. It can be bought in Pravoka and can be learned by the Black Mage, Black Wizard, Red Mage, Red Wizard, and Ninja job classes.
Dark or Darkness, is the polar opposite to brightness, is understood to be an absence of visible light. It is also the appearance of black in a colored space.