Ultima Beam is an enemy ability used by Ultimate Weapon, which inflicts major non-elemental magic damage to the party at the cost of 40 MP. It is the only attack in the game in which the player can use the Elemental materia combined with a non-elemental materia to absorb it due to it being the only offensive attack to use the hidden Hidden element.
Ultima Beam is an active magic ability that inflicts neutral magical damage on all targets for 15 AP. It can be used by Ultima Weapon.
Ultima means "the last" in Latin and many Latin-based languages. In the Spanish versions of many Final Fantasy games, it is written as "Artema," a close transliteration of the Japanese katakana.