Lightbringer

The Lightbringer is a weapon appearing in a few Final Fantasy games. It is usually one of, if not the strongest sword available.

Final Fantasy
The Lightbringer only appears in the Advance port, and is the Red Wizard's best weapon. It is obtained if the player successfully defeats Death Gaze in the Whisperwind Cove. If used as an item, it will cast Holy.

Final Fantasy IV
The Lightbringer only appears in the Advance port, and is Cecil's best weapon. It is obtained if the player successfully performs noble deeds, as is a Paladin's job, in Cecil's Lunar Trial. It randomly casts Holy.

Final Fantasy VI
Originally translated as Illumina, Lightbringer is the most powerful weapon in Final Fantasy VI, and it is a sword. It is obtained by betting the Ragnarok sword in the Colloseum. Its Battle Power is 255, and it also increases Vigor, Speed, Stamina, and Magic Power by 7. It also increases Evade and MBlock by 50% each. Due to a bug in the game, the Evade bonus does nothing, and the MBlock bonus also affects physical attacks. It has a random chance of casting the Holy spell in addition to its attack. It consumes 10 MP each turn in order to perform an automatic critical hit. The Illumina is unblockable and is a long range weapon. Terra, Locke, Edgar, and Celes can equip this weapon.

Final Fantasy XI
Lightbringer is a non-usable sword that appears in San d'Oria mission storyline. It is revealed that it was the weapon that caused the destruction of Tavnazia during the Crystal War. The main objective of San d'Oria missions is to retrieve the Lightbringer and to prevent its destructive power from being used again.