The marool is one of the most malevolent of the monsters in the waters around the Scottish Shetland Islands.[1] It was described by the folklorist Jessie SaxbyAuthor and folklorist from Unst, one of the Shetland Islands of Scotland. She also had political interests and was a suffragette. in her Shetland Traditional Lore (1932) as a sea-devil in the form of a large fish, which appears particularly during storms when the sea foam is phosphorescent,[2] known as mareel:[3]
He had a crest of flickering flame, and eyes all over his head … He delighted in storm, and was heard to shout his wild exultant song when some luckless bark went under.[3]