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The void is a generic term that inhabitants of Eorzea have given to a dark realm they believe exists beyond their own. When a creature is deemed to be too unnatural to be "of Eorzea" (such as ahrimans), they are often categorized as "voidsent", based on the common belief that they were sent by some sinister force from beyond the corporeal realm.
The void is also said to be the origin of the creatures present on the Dzemael Darkhold and the Thousand Maws of Toto-Rak. Upon advancing on the instances, some of the creatures will "retreat into the void", while others will emerge from it, effectively changing the monsters currently on the area.