Deals damage to all undead foes.Final Fantasy description
Diaga (HRM3 on the NES and Dia3 in Final Fantasy Origins) is a level 5 White Magic spell, which inflicts a large amount of damage against all undead enemies and has no effect on other types of enemies. In the NES and Origins releases, it inflicts between 80 and 240 damage, while in subsequent releases it inflicts damage depending on the caster's Intelligence.
Diaga is an Enfeebling Magic spell associated with White Magic. It can be used by Red Mages from level 12 and White Mages from level 18. An upgrade of the spell Dia, it lowers enemies' Defense within the affected area and also deals gradual Light-elemental damage. Uses 12 MP to cast, it takes 1.5 seconds to cast, and 6 for subsequent casting.
In addition, stronger versions called Diaga II and Diaga III appear as enemy abilities.
Dia means "day" in Portuguese and Spanish.
In ancient Greek religion and folklore, Dia means "heavenly," "divine," or "she who belongs to Zeus." The name is attributed to several figures, and thus is treated like an honorific or title.