Deluge (known as Big Wave in the SNES release and Tidal Wave in the GBA release) deals damage equal to 25% of the target's maximum HP; contrary to popular belief, it is non-elemental. In the DS version, Deluge is instead a strong Water-elemental ability. It is used by Leviathan, Cagnazzo (as part of the Giant of Babil gauntlet), Ogopogo, and Lunar Leviathan.
The Chill Rod teaches the Illusionist Deluge for 300 AP. The attack deals Water damage to all foes simultaneously and costs 32 MP to cast. It is stealable through the ability Steal: Ability, is also susceptible to Absorb MP, and has a Magic Power of 17.
Deluge is again learned through the Chill Rod by Illusionists, but now requires only 250 AP to master and 28 MP to cast. Its effects are the same as before.
Deluge is the summon attack of Cagnazzo. Twenty seconds after Cagnazzo is summoned, Deluge switches the Brave of both characters.