The Worm that Gnaws in the Night

The Worm that Gnaws in the Night (the Doom of Shaggai) is an entity that appears in Lin Carter's short story "Shaggai" (1971]). The being is portrayed as an enormous, worm-like entity. The Worm was first observed by the Eibon, who chanced upon it on a sojourn to the planet Shaggai. To his horror, Eibon discovered that the massive worm was slowly eating away at the vitals of Shaggai and subsequently made a hasty return to Earth.

It appears to be similar in size and description to the Graboids from the popular movie series Tremors.