Wyrms, occasionally spelled Wurms or Worms, are a legless and wingless species found inhabiting bodies of water, typically oceans but sometimes large rivers and lakes as well. They bear a resemblance to the Knucker.
The most well-known example of Wyrms in folklore is the Lambton Worm. According to legend, if the Wyrm was cut into pieces, it would simply grow back together and reattach itself. Only when John Lambton covered himself with spear-spiked armor, which the Wyrm sliced itself to pieces attempt to grapple with, and feel into the river, washing away before it could reconnect.