Dark

This materia provides the user the ability to deal shadow damage with a weapon or gain an elemental resistance to the Dark element. Once attuned with the Use Magic Device skill, the user can cast Dark spells.

Make a ranged spell attack roll against the creature to direct a blast of shadow energy at your opponent.

On a hit, the target takes 1d6 points of shadow damage + casting modifier (Intelligence or Charisma) + 1 point per caster level (maximum +5)
A failed Constitution save also inflicts the Dimmed status effect for 1d4 rounds. A successful save prevents the status effect from taking effect.