The Flood is a sleek, humanoid creature with blue skin. Its arms and legs end in points and have no distinct digits. It has a triangular head with two long, jagged, lightning bolt-shaped antennae reminiscent of the Unversed symbol. Its red eyes are set in an angry expression, and it moves in a jerking, twitchy motion. While most Floods are roughly the size of a Shadow Heartless, some in the Keyblade Graveyard are shown to be quite large. It is the only generic Unversed that does not have an Unversed emblem on its body.
Like all Unversed, the Flood is created from a negative emotion; the Flood is a monument to the sin of "irritation".
In Kingdom Hearts Birth by Sleep Final Mix, the Flood receives a palette swap which gives it a purple body and fuchsia antennae.
Interestingly, the Flood's behavior mimics that of a Shadow, the basic form of Heartless, and a Dusk, the basic form of Nobodies. Like Shadows, the Flood is able to sink flat into the ground and become temporarily invincible. Like Dusks, a Flood's body stretches and contorts when it spawns.
A "flood" is an overflow of an expanse of water that submerges land. This could refer to the danger Floods pose in great numbers and their blue coloration, as well as "overflowing emotion".
The Flood has a similar fighting style to a Shadow Heartless. It sinks into the ground to avoid damage and attacks enemies with its claws. The player can easily defend against a Flood's attack by watching for it to wave its arms just beforehand.
Although very weak, Floods can be quite a menace when they appear in large groups. While they often appear alongside larger Unversed, it only takes a few hits from the Keyblade to destroy them. It is also possible to use magic in order to defeat this enemy. If a Flood sinks into the ground, simply wait for it to surface before attacking.
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