Diamondback
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Diamondback
“Reduces damage taken by 90% and nullifies most knockback and draw-in effects.
Unable to move or take action for the duration of this effect.
Duration: 10s
If used when Waxing Nocturne is active, its effect will transition immediately to Waning Nocturne.
The effect of this action cannot be ended manually.— In-game description
Diamondback is an action unlocked at level 1. It is available for Blue Mage.
Related actions
Flavor Text
Diamondback weaves earth-aspected aether into a hard mineral shield, mimicking what many describe as the “maddening” effect of shelled dragons' carapaces. Alas, though its defensive properties are superlative, its weight makes it impossible for the caster to move while under its aegis.
Duties
- Cuca Fera from level 50 Dungeon
The Stone Vigil (Hard)
Tips
Acquisition Tips
- Cuca Fera can be defeated without use of the cannons through
Missile, 
Level 5 Death, or 
Doom. 
Phantom Flurry can also be used to defeat Cuca Fera with a single cast with sufficient (level 70+) gear and level sync not being applied.
Other Tips
- This spell is mandatory in several blue mage strategies in high-end encounters. It provides twice the mitigation as a level 3 tank limit break.
- The user will be immobilized for 10 seconds without the ability to prematurely end the effects of this spell. The user should be wary of upcoming mechanics that force them to move.
- In raid situations such as
The Final Coil of Bahamut - Turn 4, this spell consumes great amounts of MP. 
Blood Drain and 
Lucid Dreaming must be used effectively to restore MP.
History
Patch 4.5 (2019-01-08): Added.