Perfect Defense

Perfect Defense is a reccuring ability in Final Fantasy series. It always makes the character Invincible for a short amount of time.

Final Fantasy XI
Alexander uses Perfect Defense during the fight against him when his HP is under 10%. It will render him immune to physical, ranged, and magical attacks.

Final Fantasy XII
Perfect Defense is a Technick which renders user immune against physical and magickal attacks for about two minutes. Adrammelech, Gilgamesh, Hashmal, and The Undying can use this ability.