Lowers an enemy's defense and gradually deals Light elemental damage.


Spell cost: 45 MP
Spell element: Light
Magic skill: Enfeebling

Merit Info:

  • Has a duration of 180 seconds.


Casting Time: 2 second
Recast Time: 7 seconds

How to Obtain[edit]

Obtained: Red Mage Merit points Group 2

Other Information[edit]


Casting Dia III will lower the target's defense by 20%. This effect cannot be resisted except with Magic Shield.

Some monsters are able to use Dia III as well:

In addition, the Wamoura ability Erosion Dust inflicts Dia III.

Dia / Bio Priority
Dia and Bio do not stack.
Bio III > Dia III > Bio II > Dia II > Bio > Dia
Example: If Dia is cast, and Bio is cast afterwards, Dia will be overwritten. If Dia II is then cast, Bio will be overwritten. If Bio II is cast, Dia II will be overwritten.
Note: This is not necessarily the case for player characters who have been hit with both spells.
Useful Macros
/ma "Dia III" <t> Casts onto current target
/ma "Dia III" <bt> Casts onto last target claimed by party
/ma "Dia III" <stnpc> Allows you to select a target from available NPCs
The Meaning of Dia
The spell "Dia" comes from the Japanese release of Final Fantasy I. In the original localization of the game it was renamed as "Harm", "Hrm2", and so on. It is an abbreviation of "Dispel Undead" with the "U" in undead being an "A" in Japanese. While names in Final Fantasy XI are influenced by english, it was left as Dia to connotate with "daylight"(as per Latin-based languages) because daylight is often depicted as harmful to the undead. As such, in the localization of the FF1 remakes Harm was changed back into Dia (and animated as a blast of sunlight in graphically advanced remakes of the game to follow the theme).
Despite seeming to be a truncation of the word "diamond" in English, in Japanese the spell "Dia" bears no relationship to diamonds and is spelled and pronounced ディア(dia /diä/, "Dee-ah"), not ダイヤ(daiya /däɪjä/, "Dye-ah").

v  d  e
Magic of Vana'diel: Enfeebling Magic

Addle III  — Bind — Blind III — Dispel — DistractIIIII — FrazzleIIIII — Gravity III — Paralyze III — Silence — Slow III
Break — Breakga — Sleep III — Sleepga III
Gradual damage:
Dia IIIIII — Diaga — Poison I • II — Poisonga
Unavailable to players:
Bindga — Blindga — Curse — Diaga IIIII — Dispelga — Paralyga — Poisonga IIIII — Silencega — Slowga

Magic Category Jump: Blue MagicDark MagicDivine MagicElemental MagicEnfeebling MagicEnhancing MagicGeomancyHealing MagicNinjutsuSongsSummoning

This article uses material from the "Dia_III" article on FFXIclopedia and is licensed under the CC-BY-SA License.