There are two abilities in Japanese that are both translated as 'Invincible'. The first is インビンシブル [invincible] in Japanese. The second is 常勝 [joushou] which translates as 'invincible'.
Final Fantasy XI
Type: Special Ability
Learn at: PLD1, Use: PLD
Cast Time: instant, Recast: 1 h, Duration: 30 sec
Range: self, Radius: self, Cumulative Enmity: 1, Volatile Enmity: 7,200
Description: Grants immunity to all physical attacks
Other: damage is reduced to 0 for physical attacks only, does not affect magical damage
Other: can be modified by Valor Breeches +2
Other: インビンシブル in Japanese
Final Fantasy XIV

Type: Paladin Ability
Learn at: PLD50 (quest), Equip: PLD
Target: self, Recast: 900 s, Duration: ?
Description: Renders you impervious to physical attacks
Other: as 'Hallowed Ground', インビンシブル in Japanese
A Realm Reborn

Type: Paladin Ability
Learn: PLD50 (quest), Use: PLD
Cast time: (instant), Recast: 420 s, Duration: 10 s
Potency: -, Range: 0, Radius: 0
Description: Renders you impervious to most attacks
Other: as 'Hallowed Ground', インビンシブル in Japanese
Record Keeper

Type: Record Materia, Record Materia Level: 1, Rarity: -
Obtain: Limit Break Celes
Effect: Attack occasionally becomes Blizzard Blade
Other: 常勝 in Japanese
Category: Ability