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


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


Casting Time: 2 second
Recast Time: 7 seconds Spell Duration: 180 seconds

How to Obtain

Auction House Category: Scrolls > White Magic ( )


139,125 gil

Hasim - Lower Jeuno (H-9)

Other Information

Dia III initially lasts 30 seconds. Each upgrade increases the duration of the spell by 30 seconds.

Casting Dia III will lower the target's defense by approximately 15% (39/256). This effect cannot be resisted except with Magic Shield.

April 3, 2019 Version Update
"The defense down effect of the white magic spell Dia has been adjusted. Numbers in parenthesis represent the value when affected by the Corsair ability Light Shot.
Name Pre-adjustment → Post-adjustment
Dia 5% → 10%(13%)
Dia II 10% → 15%(18%)
Dia III 15% → 20%(23%)
Diaga 5% → 10%(13%)"
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. Since Light and Dark are in opposition, whichever spell is higher level (requires a higher level job to use), overwrites the other.
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").

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