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The Graymel are a spacefaring alien civilization who were once engaged in a conflict with the Romulan Star Empire.
In the late 23rd century, a Graymel scourge vessel engaged a Romulan bird-of-prey in battle and used an isolytic subspace weapon, destroying the nearby planet Algeron III. Praetor Gell Kamemor considered the Graymel still hostile against Romulus in the year 2383. (ST - Typhon Pact novel: Raise the Dawn)