Shellga (シェルガ, Sheruga?) is a form of White Magic. It is a recurring spell throughout the series. It provides protection versus magical attacks, generally, but not always, halving magical damage. It is similar to Shell but it grants the effect to all party members, or in games where spacing is important, all party members within range of the spell caster.
In the Zodiac versions, Shellga is a White Magick spell, its license being White Magick 12 that costs 110 LP. The spell itself cannot be bought, and only found in the Great Crystal in Giruvegan. Three classes can use it: White Mage, Monk, and Shikari. Monk must acquire the Esper Chaos license and Shikari the Esper Cúchulainn.
Shellga is a spell only Basch can cast. It casts Shell on a group of allies.
Shellga is a command-type ability for the Synergist role. It enhances all allies' magical resistance. It can be learned by Noel (role level 21), Gigantuar (59), Imp (29), Luminous Puma (18), Oannes (45), and Triffid (46). It has an ATB cost of 3 and a duration of 30 seconds.
Shellga is a White Magic ability with a Rarity of 4☆. It gives all targets Shell, doubling Resistance, it can initially be used four times and it can be honed to Rank 5. It can be created by using Greater White Orb x5, Greater Earth Orb x3, Greater Holy Orb x3 and 10000 gil.