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Vessel of the Ritual - AI-generated fantasy Monster

Vessel of the Ritual

Long ago, a noble of a minor Drow house attempted to ascend beyond Lolth's favor using forbidden Sanguine Weaving. The ritual collapsed when the noble's ego could not contain the pressure of the Underdark's concentrated lifeforce. Now, it is a mindless guardian kept by the cult as a warning and a beast of burden in the deeper reaches of the Undermyr.

Monsters
Medium monstrosity · Hard · Unique

Vessel of the Ritual

A Drow noble mutated by a failed blood magic ritual, transformed into a semi-arachnid horror suspended in a living web of pulsing veins.
AC16
HP104/104
CRHard
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 16 · HP 104 · Hard

Vessel of the Ritual

Medium monstrosity (drow), neutral evil
Armor Class16 (Natural Armor)
Hit Points104 (16d8 + 32)
Speed
30 ft.,
Climb 40 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsDexterityConstitution
SkillsStealthPerceptionAthletics
Damage Resistances
Necrotic,
Poison
Immunities
Charmed,
Frightened
Weaknesses
Fire
Senses
Blindsight 60 ft. (Blind beyond this radius),
Passive Perception 14
Languages
Understands Elvish and Undercommon but cannot speak
ChallengeHard
Proficiency Bonus+3
Spider Climb. The vessel can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Thermal Sight. The vessel's blindsight is based on heat. It has advantage on Wisdom (Perception) checks to find any creature that is not Undead or a Construct.
Agony Spasms. Any creature that starts its turn grappled by the vessel or touching it takes 7 () psychic damage from the sheer intensity of the vessel's pain.
Web Walker. The vessel ignores movement restrictions caused by webbing.

Actions

Multiattack. The vessel makes three attacks: one with its Sanguine Bite and two with its Flaying Claws.
Sanguine Bite. Melee Weapon Attack: to hit, reach 5 ft., one creature. Hit: 13 () piercing damage plus 9 () necrotic damage. The vessel regains hit points equal to the necrotic damage dealt.
Flaying Claws. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 11 () slashing damage.
Blood Web (Recharge 5-6). The vessel ejects a mass of sticky, vein-like webbing at a point it can see within 30 feet. Each creature in a 10-foot radius must succeed on a Dexterity saving throw or be restrained. While restrained, a creature takes 5 () necrotic damage at the start of its turn as the web siphons its blood. A creature can repeat the saving throw at the end of each of its turns, ending the effect on a success.

Reactions

Spasmodic Lurch. When the vessel takes damage, it can move up to half its speed without provoking opportunity attacks.
Role
Stealth/Stalker
Built for
6

Gear

  • The Eightfold Oculi (Treasure, 500 gp each)Eight black rubies embedded in its skull.

Feats

Mobile

Augmentations

Sanguine Weaving Mutations

Notes for the game master

High mobility is key to this fight. Use the Spasmodic Lurch to move to the ceiling after being hit by melee attackers.
The Blindsight means Darkness spells do not hinder it, but it cannot see Cold-based constructs easily.

Tactics

  1. Opening

    The vessel starts on the ceiling, hidden in the shadows. It waits for the character with the highest Strength or heavy armor (usually the warmest) to pass underneath, then drops for a Surprise round using Multiattack.

  2. Mid-fight

    It uses Blood Web to trap spellcasters or ranged characters, then focuses its Sanguine Bite on restrained targets to heal any damage taken.

  3. End of the fight

    When reduced to 25% health, it enters a frenzy, focusing entirely on the nearest source of heat and ignoring opportunity attacks to bite.

  4. Retreat

    The Vessel of the Ritual is a mindless thrall of its own pain; it fights until destroyed. It cannot be reasoned with.

How it fights

Use Spider Climb to stay out of reach of pure melee fighters.
Target characters that use fire spells or torches first, as they represent the highest 'heat' sources.
Always use the Spasmodic Lurch to reposition toward a corner or ceiling.

Who it attacks first

Warm-blooded Humanoids
Creatures holding light sources or fire magic
Injured creatures (the scent of blood)

Works well with

Drow Blood Mages can use their bonus actions to heal the Vessel by sacrificing their own HP.
Giant Spiders can provide regular webbing to create difficult terrain for players while the Vessel moves freely.

How to beat it

Fire damage shuts down its regeneration for one round.
Cold damage reduces its movement speed by 10 feet.
Fog Cloud or Smoke obscures its thermal-based Blindsight.

Ways to avoid a fight

Players can distract it by throwing a high-heat source (like a torch or a Heat Metal'd object) into a different corner.
An expert in Arcana can attempt a DC 18 check to momentarily stabilize its blood, paralyzing it for 1 round.

Ecology

The creature's torso is Drow-like but elongated and translucent, revealing black ichor flowing through veins. From its back and ribs, eight spindly, chitinous legs sprout, anchored to a ceiling-spanning web of meaty fibers. Its face is a ruin of stretched skin, where eight faceted black rubies are embedded in a radial pattern across its forehead. It lacks a nose and mouth in the traditional sense, possessing instead a vertical maw of serrated fangs that drips a constant stream of crimson serum.

Behavior

Driven by eternal physical agony and an insatiable hunger for warmth, the Vessel remains motionless until it detects the heat of a living body. It moves with a jerky, unnatural gait, twitching violently between bursts of predatory speed. It does not speak, only emitting a low, wet hissing sound that vibrates in the chests of those nearby.

How it lives

As a ritual failure, the Vessel is an evolutionary dead end. It does not eat for nutrition but to soothe the burning heat in its cursed blood. It functions as a biological disposal system for the cult that created it.

Lair

The Weeping Cell, a damp stone chamber covered in a network of pulsing, vein-like webs that drip blood into stagnant pools.

Habitat
Underdark, specifically the Undermyr chambers.

Signs that it is near

Rhythmic thumping sounds like a distant heartbeat
Cold walls that feel moist and sticky
Discarded Drow armor crushed into balls
Faint scent of iron and ozone

Tags

Spider,
Mutant,
Blood Magic

Lore

Long ago, a noble of a minor Drow house attempted to ascend beyond Lolth's favor using forbidden Sanguine Weaving. The ritual collapsed when the noble's ego could not contain the pressure of the Underdark's concentrated lifeforce. Now, it is a mindless guardian kept by the cult as a warning and a beast of burden in the deeper reaches of the Undermyr.

What drives it

To find a temporary reprieve from its internal torment by consuming the blood and body heat of others.

After the fight

Once defeated, the rubies turn dull and the body rapidly dissolves into a pool of foul-smelling black sludge, leaving only the gemstones and any metal gear behind. The vein-webs in the room begin to wither and die within hours.

“The ritual collapsed when the noble's ego could not contain the pressure of the Underdark's concentrated lifeforce.”
From its lore

Variants

Greater Vessel: CR 9, adds a Frightful Presence (Aura of Agony).
Lingering Soul Vessel: Add Ghostly traits, allowing it to move through walls.

Hooks

Plot hooks

A Drow House Mother wants her 'failed' son put out of his misery and his ruby eyes returned.
The party needs a sample of the 'living ichor' that flows within the Vessel to counter a blood plague.

How to use it

A guardian in a hallway leading to a Drow ritual chamber.
A trap for players investigating a 'crying' sound in the Undermyr.

Treasure

8 Black Rubies (500 gp each)
A Noble's Signet Ring partially melted into its flesh (worth 150 gp to the right Drow historian)

Media

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