Holy (Ultima)

Holy is a magic spell used by Aerith in Kingdom Hearts Ultima. When used in Hollow Bastion, all of Radiant Garden can summon the the Realm of Light to travel to other constellations.

The spell is used at the Crystal Chamber, which is located in Hollow Baston where Dark Depths used to be. (Dark Depths where Sora and company fight Behemoth, and the Keyhole here is sealed.)

Etymology
Holy is a recurring spell in the Final Fantasy series. The spell is also known as "Faith" and "Pearl". In most games, Holy has the distinction of being the only White Magic spell to be used offensively. Its divine power is most effective against both dark-aligned and undead creatures.

Trivia

 * In Kingdom Hearts II, "Faith" is a Reaction Command for Sora's and Queen Minnie's Limit for Disney Castle, it deals damage to all nearby Heartless.