Lightbringer

The Lightbringer, sometimes known as the Illumina is a weapon appearing in many Final Fantasy games. It is usually one of the, if not the strongest sword available.

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, it can be obtained if the player bets the Ragnarok in the Dragon's Neck Colloseum.