Nilshai

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Nilshai, also known as Ethereal Theurges, are a species of trilaterally symmetrical, worm-like aberrations who inhabit the Ethereal Plane. Powerful mages, they regularly invade the material plane to take humanoid slaves.

They first appeared in Dungeons & Dragons 3rd Edition, making their debut in the "Unapproachable East" splatbook for Forgotten Realms, and were then expanded upon in the 3e splatbook Lords of Madness.