FREQUENCY: Rare <(most of the Plane of Shadows, though they are more common in forested areas)>

FREQUENCY: Rare ([Cold Wilderness Forest])
FREQUENCY: Very rare ([Cold Wilderness Mountains], [Cold Wilderness Hills], [Cold Wilderness Swamp])

FREQUENCY: Rare ([Temperate Wilderness Forest])
FREQUENCY: Very rare ([Temperate Wilderness Mountains], [Temperate Wilderness Hills], [Temperate Wilderness Swamp])

FREQUENCY: Rare ([Tropical Wilderness Forest])
FREQUENCY: Very rare ([Tropical Wilderness Mountains], [Tropical Wilderness Hills], [Tropical Wilderness Swamp])

FREQUENCY: Very rare ([Dungeon Level VII])

NO. APPEARING: 1
ARMOR CLASS: 1
MOVE: 1"
HIT DICE: 10 ~ 10
% IN LAIR: 0%
TREASURE TYPE: Nil
NO. OF ATTACKS: 1
DAMAGE/ATTACK: 2-20
SPECIAL ATTACKS: Acid
SPECIAL DEFENSES: Poison bristles
MAGIC RESISTANCE: Standard
INTELLIGENCE: Animal
ALIGNMENT: Neutral
SIZE: M (6' long)
LEVEL/X.P. VALUE: VII | 2400 + 20

SAVES: 8.9.10.9.11

These insectoid predators inhabit most of the Plane of Shadows, though
they are more common in forested areas. They seek warm-blooded prey
but will hesitate to attack humans.

Tenebrous worms are formidable opponents in combat;

Acid: their heads are
equipped with powerful mandibles that drip a highly caustic acid
secreted from glands located behind the creature's multi-faceted eyes.
Any opponent struck by the mandibles is also subject to the effects of the
secretion (save vs. poison at -3, or take double damage from the bite).

The head and forebody of the monster are covered with stiff bristles
which are poisonous to mammals. Any opponent who strikes the protected
area with an open hand or similar attack (claw, bite, cause
wounds spell, etc.) will immediately be filled with filaments from the
bristlesandwill suffer 1-4(1d4) points of damage. The victirn must also
save vs. poison or be paralyzed from the contact. Such victims must
receive a neutralize or slow poison spell within 1-4 rounds or the contact
will be fatal. Opponents who strike with a weapon gain the benefit of
armor against this defense. To determine if contact occurs, multiply the
attacking character's AC (minus shield and dexterity bonuses)
by 1 Oto determine a percentage. Contact occurs if this number or lower
is rolled on percentile dice. Note that there are fewer bristles on the
creature's head. Toreflectthis, reduce the chance of contact by 20%. For
example, a character with plate and shield would have a 30% chance of
contact with the bristles (AC 2 plus 1 for disregarding the shield times
10), but this would drop to 10% if the attack were aimed at the head.

Tenebrous worms look like huge, partially bare caterpillars. The front
section of the body is covered with lusterless black bristles, while the
hind parts are a wet, nauseating grey. The manyfacets of the creature's
eyes reflect the half-light of the Plane of Shadows with a luminous
glimmer. This glimmer is the only warning of their presence. Their
small, black legs allow them to move rapidly. Their great maws are
flanked by huge, pearly mandibles. These tusk-like weapons are quite
beautiful if cut into sheets and inlaid (as is mother of pearl), so they have
a value of 1000-3000 gp per set.

For the adult stage of this monster, see "Gloomwing."