Suspiria's array was a Delta Quadrant space station maintained by the Caretaker's former mate, home to about two thousand Ocampa whose mental powers and lifespans she had greatly extended.
The station appears in the second-season episode Cold Fire. It is a smaller cousin of the Caretaker's array, run by the female Nacene Suspiria, who left Ocampa centuries earlier and took a group of Ocampa with her.
Under her guidance the residents, led by Tanis, developed formidable psychokinetic abilities and lived well beyond the usual nine years. Neighbouring species feared the station and its inhabitants.
When Voyager finds it, Tanis offers to train Kes while secretly helping Suspiria, who blames Janeway's crew for the Caretaker's death. Suspiria attacks the ship but is subdued with a toxin, and Janeway releases her; she withdraws into Exosia.