In northern European countries the Worm (Wyrm or Wurm) is found. It is one of the most ferocious dragons. They live deep beneath the earth, and they guard gems and treasure such as gold. These dragons are huge and usually wingless they are covered in thick hard scales that are said to be like the strength of steel. They often are fire breathers. Worms take vengeance on those that steal from their hordes.

One of the best known worms was the nemesis of the warrior king Beowulf. Beowulf slew the dragon but at the cost of his own life. The legend says that Beowulf was buried with the Worm's treasure.