Deals dark damage that weakens an enemy's attacks and gradually reduces its HP.


Spell cost: 15 MP
Spell element: Dark
Magic skill: Dark 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: 5 seconds

Other Uses[edit]

Resale Price: ~102 gil

How to Obtain[edit]

Auction House Category: Scrolls > Black Magic ( )


Price: 360 - 416 gil
Name Location Type
Aroro Port Windurst (H-8) Standard Merchant
Regine Port San d'Oria (J-8) Standard Merchant
Zaira Bastok Markets (H-5) Standard Merchant
  • Note: Apparently the availability of this scroll from these Merchants is subject to the nation where you're trying to buy it having ended 1st or 2nd in the previous Conquest. (This needs to be confirmed.)

Other Information[edit]

Effect Duration
1 Minute (60 Seconds)
Enemy Attack down effect
Attack is reduced by 27/512 (5.27%)
Dia / Bio Priority 
Casting Bio of the same tier as its Dia counterpart will result in the Dia status being removed (Dia and Bio do not stack). 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.
Bio III > Dia III > Bio II > Dia II > Bio > Dia


  • Use of Dia in a party should be balanced with the use of Bio as Bio will overwrite Dia, but Dia will not overwrite Bio. Dia should generally be used on high-defense mobs such as Crab.
  • Use of Bio in Campaign Battles counts toward Elemental Magic Damage in terms of rewards calculation, despite its primary use being that of enfeebling. The reward is based solely on the initial damage reported in the log, and not on the overall damage-over-time.

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