Mester Stoor Worm

An inhabitant of the Scottish and Norse seas, the Stoor Worm or Mester Stoor Worm (literally master violent dragon, being wyrm an obsolete variant of the word worm, meaning dragon or serpent, and stoor or stour a term used by Scots to describe fighting or battles) was a mythical serpent-like creature created by malevolent spirits. A gigantic beast with a ferocious appetite, it was able to demolish ships and houses with its prehensile forked tongue it used as a pair of tongs, and even to drag entire hillsides and villages into the sea.

Its eyes were like "round lochs, very deep and dark" and it "glowed and flamed like a blue ward fire"