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"It's not what I am that matters, it's what I do. You don't know the minds I've touched. Catullus, Tarbolde, Keats, a hundred others. I unlocked their potential."
– Onaya, 2372 ("The Muse")

Onaya was an energy being that could assume corporeal form.

It both increased exponentially and fed off the creative energy generated by the stimulated brain of another being. The process usually proved damaging to the subject being stimulated, as the strain of increased capillary dilation, neurotransmitter production, and general neural activity would cause synaptic collapse and, if left untreated, death. Onaya justified its activities by saying that victims would receive immortality for the creative ventures that were a byproduct of its activities.

It had traveled for thousands of years seeking compatible creative beings, and found hundreds such as the Earth poets Catullus and John Keats, the Cardassian architect Tavor Kell, and Tarbolde from Canopus Planet. Onaya could be detected by tricorders set to scan for psionic energy residue.

Onaya arrived aboard a Bajoran transport to Deep Space 9 in 2372, where she met Jake Sisko, and eventually fed off his creative energies as he was working on his first novel, Anslem. Jake's life was saved when his father, Benjamin, intervened. Onaya, however, was able to escape from the station, vanishing into the unknown. (DS9: "The Muse")

Onaya was played by actress Meg Foster.
She was described in the script as "a striking Alien Woman [...] Her features are vaguely feline, though you might have to look twice to see she wasn't human. Her skin is pale, her hair long and dark, like her dress, which is flowing and diaphanous. It's hard to guess her age, mid-thirties, maybe forties."
In The Ashgate Encyclopedia of Literary and Cinematic Monsters, Bradley Skene compares Onaya to Lamia of Greek mythology and the Leanan sídhe of Irish mythology.

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