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


Spell cost: 30 MP
Spell element: Light
Magic skill: Enfeebling Magic

Note: Automatons learn this spell automatically once they have the requisite magic skill. They do not need to use a scroll.


Casting Time: 1.5 seconds
Recast Time: 6 seconds

Other Uses

Resale Price: ~1,612 gil

How to Obtain

Auction House Category: Scrolls > White Magic ( )


Price: 10,080 - 11,872 gil
Name Location Type
Quelpia Selbina (H-9) Standard Merchant
Shohrun-Tuhrun Windurst Waters South (G-7)

@ Federal Magic Reserve

Standard Merchant

Note: Shohrun-Tuhrun will only sell this when Windurst is 1st of 2nd in Conquest.

Other Information

Effect Duration
2 Minutes (120 Seconds)
DOT damage 2hp/tic
  • Initial damage has a soft cap of 8.
Enemy Defense Down effect
Defense is reduced by 53/512 (10.35%)
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%)"
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 II" <t> Casts onto current target
/ma "Dia II" <bt> Casts onto last target claimed by party
/ma "Dia II" <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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