Ferdiad's Fool

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The trademark of a high-ranking voidsent is his ability to use accumulated aether to summon further thralls from the void to fight by his side. These loyal subjects, while similar in build and cunning to imps or devilets, do not require vessels to survive, instead maintaining their semi-corporeal form through a transference of aetherial energies directly from their host, Ferdiad.

— Encyclopædia Eorzea vol 2