There are two members of the w worm monster class, each with baby counterparts:
[The crysknife] is manufactured in two forms from teeth taken from dead sandworms. The two forms are "fixed" and "unfixed". An unfixed knife requires proximity to a human body's electrical field to prevent disintegration. Fixed knives are treated for storage. All are about 20 centimeters long. [ Dune, by Frank Herbert ]
A gargantuan version of the harmless rain-worm, the purple worm poses a huge threat to the ordinary adventurer. It is known to swallow whole and digest its victims within only a few minutes. These worms are always on guard, sensitive to the most minute vibrations in the earth, but may also be awakened by a remote shriek.
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