Damage is dealt to MP rather than HP.
Final Fantasy Tactics description
Mana Shield (MPすり替え? or MPすりかえ, MP Surikae?, lit. MP Switch), also known as MP Switch and Damage > MP, is a recurring ability in the Final Fantasy series, primarily found in the Ivalice Alliance games. It transfers a portion of the damage the user takes into MP damage.
There is also an unrelated enemy ability in Final Fantasy VII Rebirth called Mana Shield.
Appearances[]
Final Fantasy Tactics[]
Mana Shield is a reaction ability learned by the Time Mage class for 400 JP. Upon taking damage from any source, the damage is taken out of the user's MP instead of HP unless the user has 0 MP before damage is taken. If damage taken is greater than the amount of MP the user has, the user's MP is reduced to 0.
Final Fantasy Tactics Advance[]
Converts HP damage to MP. (Doesn't work if MP is 0).
Description
Damage > MP is a reaction ability learned by the Blue Mage, Gadgeteer, and Morpher classes for 300 AP from the Judo Uniform.
Final Fantasy Tactics A2: Grimoire of the Rift[]
MP Shield is a reaction ability learned by the Blue Mage, Tinker, and Arcanist classes for 450 AP from the Mirage Vest. If damage dealt to the user is greater than the amount of MP they currently have, any overflow is taken from the user's HP.