Automatically cast Shell when near KO.
Critical: Shell, also known as Magic Shell, Barrier, 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.
Magic Shell, originally known as Barrier in the RPGe translation and MagiWall in the PSX version, is learned for 10 AP from the Mystic Knight class, and can be used by the Freelancer class without having to equip it.
Critical: Shell is the innate ability of the Barrier Ring. The status will remain even after the user has left critical HP and will act as normal.
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 in the game. While both abilities are triggered when the character's HP is at 30% of max HP or lower, Critical: Weak Shell provides worse 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.