Fiendwurm

A fiendwurm is the result of demonic magic applied to an ordinary earthworm. This tormented monster is constantly wracked with unbearable pain from the planar portal embedded in its belly. Eating relieves the creature’s pain for a short while, so it attempts to swallow any creature it encounters. Its tortured existence keeps it constantly on the hunt.

A fiendwurm is a 40-foot-long, serpentine creature with a mottled gray and pink hide. Its huge maw is filled with long, snakelike fangs. The creature is never at rest; its intense pain causes it to writhe and squirm constantly.

Fiendwurms are in such terrible agony that they are unable to communicate at all.

Combat

A fiendwurm immediately lunges to bite and swallow any living creature it chances upon. If it seems to be overmatched, it uses its demonic belch ability to summon aid. A fiendwurm does not stop attacking until it is slain.

Death Rift (Su): Upon its death, a fiendwurm’s portal implodes. Every creature within 5 feet of the fiendwurm that fails a Reflex save (DC 31) is drawn into the collapsing portal and transported to the Abyss. The implosion destroys the fiendwurm’s body along with the portal. Thus, any creatures transported to the Abyss via a death rift must find another means of returning to their original planes.

Demonic Belch (Su): Three times per day, a fiendwurm can use its connection with the Abyss to bring 1d4 demons to its aid. It expels these creatures from its mouth with a great belching sound. The demons arrive unharmed, but the fiendwurm’s pain may cause it to attack them thereafter, if they seem to be easier prey than the opponents, or if there are no other creatures left to eat. Roll d% to determine the kind of demons that arrive: 01–50 jovocs, 51–75 quasits, 76–100 vrocks. These demons cannot use their summoning abilities for one hour after being snatched out of the Abyss. Once a fiendwurm uses this ability, it must wait 1d4 rounds before using it again.

Improved Grab (Ex): If a fiendwurm hits an opponent that is at least one size category smaller than itself with a bite attack, it deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity (grapple bonus +49). If it gets a hold, it can try to swallow the opponent in the next round. Alternatively, the fiendwurm has the option to conduct the grapple normally, or simply use its jaws to hold the opponent (–20 penalty on grapple check, but the fiendwurm is not considered grappled). In either case, each successful grapple check it makes during successive rounds automatically deals bite damage.

Swallow Whole (Ex): A fiendwurm can swallow a grabbed opponent that is at least two size categories smaller than itself by making a successful grapple check (grapple bonus +49). Once inside the fiendwurm, the opponent takes 2d8+13 points of bludgeoning damage and 1d8 points of acid damage per round from the creature’s gizzard. See Swallow Whole for information on escaping the fiendwurm’s gullet, which has an AC of 20 and 25 hit points. A creature may also be ejected through the fiendwurm’s portal. A Gargantuan fiendwurm’s gizzard can hold 2 Huge, 8 Large, 32 Medium-size, or 128 Small or smaller creatures.

Acidic Hide (Ex): A fiendwurm produces a highly caustic mucus that coats its entire body. Touching its hide deals 3d6 points of acid damage to an organic creature or object, 5d8 points of acid damage to a metallic creature or object, or 1d10 points of acid damage to a stony creature (such as an earth elemental) or object. A gallon or more of water is needed to wash off the mucus.

Portal (Su): Lining the lowest part of the fiendwurm’s gizzard is a portal to the Abyss that is activated by the presence of a living creature. A swallowed creature must make a Reflex save (DC 31) each round to avoid falling into or being squeezed through the portal. The Abyssal side of the portal is stationary, but the other side moves with the fiendwurm. If this portal is permanently closed, the fiendwurm instantly dies but does not implode.

Tremorsense (Ex): A fiendwurm can automatically sense the location of anything within 120 feet that is in contact with the ground. See Tremorsense.

Source: Monster Manual II, page 99. This creature’s statistics block has been updated to version 3.5 as given in the D&D® V.3.5 Accessory Update for Monster Manual II.