Automatically cast Shell when near KO.
Critical: Shell (ピンチにシェル, Pinchi ni Sheru?), also known as Magic Shell, MagiWall, and SOS Shell, is a recurring support ability in the series. It grants the Shell status as long as the user is in Critical HP or below a HP threshold.
Casts Shell when HP is low.
SOS Shell is an ability that can either be obtained on dropped armor or customized onto armor by using 8x Lunar Curtain, which adds 4,000 gil to the armor's sell value.
SOS Shell is an ability only usable through the use of the Selene Guard Garment Grid, and will grant the Shell status as long as the user is below 33% of their Max HP.
Critical: Shell is a passive ability which grants Shell to a character with low HP (30% of max HP or lower). It can only be acquired through the use of an Auric Amulet accessory.
Aside of the standard Critical: Shell, a weaker version of the ability aptly named Critical: Weak Shell, also appears. While both abilities are triggered when the character's HP is at 30% of max HP or lower, Critical: Weak Shell provides lower resistance to magic damage than Critical: Shell. Critical: Shell is available through the accessories Auric Amulet and Durable Auric Amulet, while Critical: Weak Shell is exclusive to Delicate Auric Amulet.