Lunar Leviathan is an optional boss in the Game Boy Advance and PlayStation Portable remakes of Final Fantasy IV. It is fought during Palom and Porom's Lunar Trial at the Lunar Ruins. When beaten, the player obtains the Twin Stars, which allow Palom and Porom to cast Double Meteor as one of their Twin Magic spells, and the Grimoire LL, which, if used as an item, summons Lunar Leviathan to deal 9,999 Water-based damage to all enemies. Using up the Grimoire unlocks the trial door again.
Lunar Leviathan's attack patterns are similar to his counterpart, Leviathan. He will use Deluge when his mouth is open, and Blizzaga when his mouth is closed. Lunar Leviathan also uses Maelstrom to inflict Critical on the party. Lunar Leviathan uses Tidal Wave in two moves.
Lunar Leviathan is weak against Lightning damage.
Porom should heal immediately after Maelstrom, or someone in the party should quickly use a Megalixir, before Lunar Leviathan uses Tidal Wave to kill the entire party in two moves. Meanwhile, Palom should cast Thundaga or Flare, and if Edge is in the party, he should use Blitz to hit Lunar Leviathan's weakness.
Luna means "moon" in Latin, Italian, Romanian, Russian, and Spanish.
Leviathan (Biblical Hebrew לִוְיָתָן or לווייתן Liwyāthān) is a violent sea creature referred to in the Hebrew Bible as well as the Talmud and some other ancient Jewish texts. During the golden age of seafaring, the term Leviathan became synonymous with any large sea creature, sometimes describing whales. Bible scholars interpreted Leviathan to be either a demonic sea creature and an enemy of God.
The Talmud and other ancient Jewish sources refer to Leviathan more specifically as a sea serpent, sometimes with multiple heads capable of breathing fire, that was made on the fifth day of Creation. It is said that during the end of days, God will make tents, or sukkah, out of the skin of Leviathan for the righteous to live in. Some have speculated that Leviathan was based on a real animal, the most popular theory being the Kronosaurus and the Nile crocodile.
Being mentioned in the Final Fantasy series as the King of the Seas, its incarnation also appears to derive from the legends of the Shinto god Ryūjin or Owatatsumi, said to be the dragon god that reigns over the seas. This is further reinforced by the parallels of the Leviathan faith of Wutai in Final Fantasy VII.
In some cultures it is believed Leviathan lives at the bottom of Mariana Trench.