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There are two members of the w worm monster class, each with baby counterparts:

Encyclopaedia entriesEdit

[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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