Bloodworm
Huge Vermin
Hit Dice: 6d8 (27 hp)
Initiative: -1 (Dex)
Speed: 1 ft., swim 15 ft.
AC: 16 (-2 size, -1 Dex, +9 natural)
Attacks: Bite +2 melee
Damage: Bite 1d8+3
Face/Reach: 5 ft. by 20 ft./5 ft.
Special Attacks: Improved grab, blood drain
Special Qualities: Exposure, Vermin
Saves: Fort +5, Ref +1 Will +0
Abilities: Str 15, Dex 8, Con 10, Int --, Wis 6, Cha 6.
Skills: Hide +4, Move Silently +4
Climate/Terrain: River of Blood (Avernus/Baator)
Organization: Solitary, Pack (3-5), Swarm (6-8)
Challenge Rating: 5
Treasure: None.
Alignment: Always neutral
Advancement: 7-8 (Huge), 9-10 (Gargantuan)

Bloodworms are natives of the River of Blood, feeding on those creatures foolish enough to try and ford the congealing flow.  They normally remain dormant, buried in the scabby muck at the bottom of the river until disturbed by a boatman’s pole,  the trod of someone’s foot, or the flailing of some creature attempting to swim in the nauseous liquid.

The average blood worm measures 20 feet long and about a foot wide, with a segmented skin of bright pink like an earthworm’s.  At one end it has a toothy maw with which it latches onto its victims.  Bloodworms cannot remain for long outside their river, and quickly shrivel and dry out, resembling a gnarled tree branch when having died from exposure.

Combat: A bloodworm attacks by biting its victim, latching on and draining blood until sated or killed.  It instictively tries to pull its prey beneath the surface of the river, wrapping its long, slimy body about the victim to keep her from surfacing.

SA – improved grab (ex): With a successful bite attack, a bloodworm may attempt a grapple check (+14) to pull an opponent under the surface of the river and keep her there.
SA – blood drain (ex): A successful bite means the bloodworm latches on and causes 1 temporary Constitution damage every round until killed or until 12 points are drained.
SQ – exposure: A bloodworm suffers 1 damage per round spent out of the River of Blood.
SQ – vermin: Immune to mind-influencing effects.

Source: "To Baator and Back” from Well of Worlds
Converted by Kajal, the Southern Oracle