|Cloud: I couldn't finish 'em. Looks like this's gonna get complicated.|
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In the SNES, PS, GBA and PSP versions, Leviathan has two forms, one in which his mouth is open, one in which it is closed. When his mouth is open, Leviathan will use Tidal Wave to attack the party for considerable damage. When his mouth is closed, Leviathan casts Blizzara on a single party member.
Rydia should summon Ramuh, Edge should use Blitz, Kain should Jump, Cecil should attack, and Rosa should heal the party She should also use Slow (ability) as this will space out his Leviathan's attacks. Use Haste (ability) on Rydia. In comparison to Asura, Leviathan is easier to defeat, as his attacks only do about half as much damage, and he has an elemental weakness to exploit.
In the DS and mobile versions, Leviathan opens battle with Deluge, doing significant damage to the party, possibly killing all but Cecil outright. Leviathan will use Blizzara and Blizzaga and is also prone to using Deluge again without warning, even in multiple succession. If the player revives a party member, Leviathan will single them out and kill them with Blizzara if not healed quick enough. If Rydia can survive the first Deluge, and has the Bluff Augment, she can use it in tandem with Thundaga to do massive damage to Leviathan.
Leviathan from Final Fantasy IV appears as a boss in Final Fantasy Record Keeper.
Leviathan (Biblical Hebrew לִוְיָתָן or לווייתן Liwyāthān) is a violent sea creature that is 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 tides and the seas. This is further reinforced by the parallels of the Leviathan faith of Wutai in Final Fantasy VII, as Shinto also sees the worship of water dragon kami in Japan.
In some cultures it is believed Leviathan lives at the bottom of Mariana Trench.