Trance gauge immediately depleted to empty and does not fill, character does not gain EXP or AP after battle, and healing skills/some forms of damage have reverse effects (i.e. a Potion damages HP, an Ether damages MP, Regen acts like Poison, and Death fully heals HP).
Character takes half damage from physical attacks.
Cast by the white magic spell Protect, or the blue magic spell Mighty Guard. Eiko's Carbuncle summon may also cast this on all party members whenever it shows a full animation.