Thromnambular is a mystical wishing skull from The Grim Adventures of Billy & Mandy. In the series, he has the power to grant nine wishes, and upon the ninth is freed from his imprisonment within the skull. The wishes often go horribly awry. Thromnambular always speaks in rhyme and is voiced by Dwight Schultz.
The Thromnambular's role in Fusionfall Legacy is currently unknown.