Flood of Darkness is an ability used by the Cloud of Darkness in the World of Darkness. It deals more damage for each stack she obtains from swallowing the clouds that spawn.
Flood of Darkness is also a level 30 Dark Knight ability which deals a frontal aoe damage and grants Darkside for 30 seconds (at the maximum of 60 seconds) for 3000 MP per use. At level 74, it's upgraded to Flood of Shadow
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Flood of Darkness is the EX Mode for Cloud of Darkness. During this mode, Cloud of Darkness gains access to the ability [Null] Particle Beam, which lets it cancel out the lag after it attacks by using another HP attack, allowing it to attack faster in succession and combo its attacks.