Shield (シールド, Shīrudo?) is a recurring ability.
VII Shield is a spell that grants the Shield status to one ally, making them immune to physical and elemental damage. However, they can be still damaged by non-elemental magic or items. It costs 180 MP and comes on the magic materia Shield, but one must level it up by getting 10,000 AP for it before it can be used.
X-2 Shield is the unique ability of the Floral Fallal special dressphere, learned for 20 AP and costing 36 MP to cast, and can only be learned after learning the ability Barrier. It completely nullifies all physical damage done to Yuna herself, but not to the Pistils.