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The Barrier status is set by the Lunar Curtain item, granting immunity to physical attacks, making all physical attacks automatically miss. The Barrier status can be Dispelled, and can also be removed by Black Hole. It's called "Null Physical" in the DS version.
The Barrier status returns as a status effect in the sequel of Final Fantasy IV, and it functions the same way as its predecessor.
Lunar Curtain returns in the sequel, and it functions the same way as it did in the prequel.
This status is not named in-game and its an enemy exclusive status, this status is granted on the Guardian and on Humbaba when Terra faces him alone. This status reduces all damage to 0, making the afflicted immune to all physical and magical attacks. There are three instances where the Guardian will have the Invincible status.
Peerless is a status effect that makes characters immune to all physical and magical attacks for a short time, and effectively works as a Resist status regarding status attributes, locking any previous statuses in and preventing the application of new ones. The status also gives immunity against MP remove attacks.
The target glows in a yellow hue. The effect can only be used from Aeris's Limit Breaks, Planet Protector or Great Gospel. Sephiroth is perpetually in Peerless status during the Nibelheim flashback sequence, although he doesn't glow yellow.
Invincible is a status effect that makes Zack temporarily immune to all damage. He will still recoil when hit, but his HP will be unaffected. The status is activated by receiving a 777 on the DMW when not in a Modulating Phase, or with the Healing Wave Limit Break. The effect lasts 15 seconds. Some Genesis copies can also use the status.
Invincible makes the affected character immune to all physical and magical attacks, though curative spells and items still work, and targets under the status still lose HP from Poison and from using the Darkside command. Invincibility is gained from items such as Hero and Holy War or Rinoa's Limit Break Invincible Moon. The status lasts for 24 seconds.
Invincible is a status gained by using the Hero Drink item, stolen from Shuyin or as a rare drop from Node. The status may also be obtained through the ability Excellence, found in the Psychic dressphere in the International and the HD Remaster versions, which requires 120 AP to master and Physics Guard to be mastered beforehand. The Psychic also learns two types of specific invulnerability before that: Magic Guard, which nullifies magical damage, and Physics Guard, which nullifies physical damage.
Like the Psychic dressphere, Yuna can learn Shield and Barrier, two specific types of invulnerability, through her Floral Fallal dressphere. Shield nullifies physical damage, while Barrier nullifies magical damage. Both require 20 AP to learn, but Yuna must have first mastered Barrier to learn Shield.
The Songstress dressphere can grant magical invulnerability to the party through the Magical Masque, but for the Songstress to learn it the party must have acquired the key item Magical Dances, Vol II, gained from defeating the Experiment at its highest levels. Simply having the book is not enough to learn the Magical Masque; it needs 20 AP points to be taught.
The Omni-Guard status makes the character immune to any damage for a number of turns. The Warrior dressphere has an ability of the same name that can inflict the status. It costs 20 MP to cast.
There is also an additional status effect with the same effect but a different icon called Physical Shield. Physical Shield can be obtained by players by using the items Carnal Incense, Fanatic's Tonic, Fanatic's Drink, or Fanatic's Powder (this last effect also bestows the status on party members within range). Physical Shield cancels and is canceled by Magic Shield. Some of the final bosses in mission storylines are also able to set the effect at will, alternating it with Magic Shield.
Wall is a dummied out status effect that protects the unit from anything, making all attack's hit rate against the unit 0%. This includes HP and MP restoration, HP and MP damage, status affliction and status healing, along with stats increase or decrease. The status doesn't protect from abilities that costs a small amount of HP each time they are used, such as Squire's Chant and Construct 8's Task skills.
Invincible can be cast on a character during the final battle. During this battle, a Magicite will appear called ???. Using them can cast random magic, one being the ability to make a character immune to all attacks.
Invincible can only be inflicted on a character in quests. During quests, random boxes with question marks will appear to give the characters random positive status like Haste, High Jump, and Invincible.
Aerith's assist ground "HP attack", Planet Protector, will temporarily protect the player from any HP or Bravery damage. She will remain out while it is in effect and will not sustain an Assist Lock when attacked. Invincible characters do not stagger and the opponent's Brave is not affected by any attacks he or she makes.