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Lux appears in Final Fantasy: The 4 Heroes of Light as the ultimate White Magic spell. The spell was placed in the Great Tree Roots prior to the game by Queen Arbor as a seal to imprison the demon, Belphegor.
Years later Torte came to Arbor searching for Lux and opened the chest holding it; in the process, Torte broke the seal that trapped Belphegor and set him free. After the party defeats Belphegor, Queen Arbor gives them the Lux spell.
Lux can be given to any character by having the Lux Tome in the character's inventory. When the spell is used it raises everyone's max HP by around 1.5 times their original amount, casts Regen and all the ability and AP regenerate strengthening buffs on the the entire party. The ability normally costs 5 AP to use, but this lowers down to 4 AP when used by a character with the White Mage crown.
Lux appears in Bravely Default as a Staff special. In order to use the ability, the player must cast healing magic 20 times. When the ability is used, it raises the physical and magic attack and defense to all allies by 25% for four turns. In addition, all allies will have a Speed increase of 35% for the duration of the user's character theme.