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Graviton Void-Worm - AI-generated fantasy Monster

Graviton Void-Worm

Deep delvers describe a pressure in the skull before the Graviton Void-Worm arrives. Its passage through the rock leaves no tunnel, only missing stone that seems to have been somewhere else for a moment. Scholars of the Verdant Heart Nexus disagree on whether it came from beyond Aethelia's planar boundary or emerged from an older, deeper fold in the world.

Monsters
Gargantuan, often described locally as colossal monstrosity · CR 18 (20,000 XP) · Unique

Graviton Void-Worm

An extraplanar leviathan adapted to the gravity-warped depths of the Verdant Heart Nexus, where it hunts through stone as easily as through open air.
AC20
HP310/310
CR18 (20,000 XP)
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 20 · HP 310 · CR 18 (20,000 XP)

Graviton Void-Worm

Gargantuan, often described locally as colossal monstrosity (extraplanar), unaligned
Armor Class20 (natural armor)
Hit Points310 (20d20 + 100)
Speed
Burrow 40 ft. (through solid rock, petrified ironwood, or raw crystal without disturbing or leaving a passage),
Climb 20 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsStrengthConstitutionWisdom
SkillsPerceptionStealth
Damage Resistances
Cold,
Lightning,
Nonmagical bludgeoning, piercing, and slashing damage
Immunities
Force damage,
Prone
Weaknesses
Its distorted-space aura is suppressed while it is incapacitated.
The worm cannot burrow through open air, water, or unworked material softer than packed earth.
Senses
Darkvision 120 ft.,
Tremorsense 120 ft.,
Passive Perception 21
Challenge18 (20,000 XP)
Hit Dice20d20
Proficiency Bonus+6
Initiative+2
Passive Perception21
Aura of Distorted Space. Space within 20 feet of the worm is warped. Attack rolls against the worm from more than 20 feet away have disadvantage. Melee attack rolls against the worm take a custom -2 penalty. This penalty is not a condition and does not stack with itself.
Singularity Burrower. The worm can burrow through solid rock, petrified ironwood, or raw crystal without disturbing the material or leaving a tunnel, passage, or other trace. It can sense vibrations through the same materials using its tremorsense.
Distorted Passage. The worm can move through a creature's space as if it were difficult terrain. The first time it enters a creature's space on a turn, that creature must succeed on a Dexterity saving throw or take 10 () force damage and be pushed to the nearest unoccupied space.
Anchored Mass. The worm cannot be knocked prone. It has advantage on ability checks and saving throws to avoid being moved against its will.
Legendary Resistance in Motion. The worm can take 3 legendary actions, choosing from the options below. It can take only one legendary action at a time and only at the end of another creature's turn. It regains spent legendary actions at the start of its turn.

Actions

Multiattack. The worm makes one Singularity Bite attack and one Tail Sweep attack.
Singularity Bite. Melee Weapon Attack: to hit, reach 15 ft., one target. Hit: 32 () piercing damage plus 14 () force damage. If the target is Huge or smaller, it is swallowed. A swallowed creature is blinded and restrained, has total cover against attacks and other effects outside the worm, and floats in zero gravity inside its maw. At the start of each of the worm's turns, the creature takes 28 () force damage. If the worm takes 60 damage or more on a single turn from a creature inside it, it must succeed on a Constitution saving throw or regurgitate all swallowed creatures, which fall prone in spaces within 10 feet of it. A swallowed creature can use its action to make a Strength check, escaping on a success and appearing prone in an unoccupied space within 10 feet of the worm. The worm can swallow up to two creatures at a time.
Tail Sweep. Melee Weapon Attack: to hit, reach 20 ft., one target. Hit: 22 () bludgeoning damage. Each creature hit must succeed on a Strength saving throw or be thrown up to 40 feet in a random direction and knocked prone. If the creature collides with a solid surface during this movement, it takes 3 () bludgeoning damage for every 10 feet it was moved.

Reactions

Space Buckles. When a creature the worm can sense enters a space within 20 feet of it, the worm shifts its local gravity. The creature must succeed on a Strength saving throw or be moved up to 10 feet in a direction of the worm's choice. This movement does not provoke opportunity attacks.

Legendary Actions

Slip Through Stone. The worm moves up to half its burrow speed without provoking opportunity attacks.
Tail Flick. The worm makes one Tail Sweep attack.
Gravity Snare (costs 2 actions). Each creature of the worm's choice within 20 feet must succeed on a Strength saving throw or be pulled up to 15 feet toward the worm and have its speed reduced to 0 until the end of its next turn.
Role
Ambush predator and battlefield controller
Built for
For a party of four or five characters around level 18; adjust encounter circumstances for lower-level parties.

Augmentations

Interlocking obsidian-chitin plates
Three concentric rings of anti-gravity crystal teeth
Singularity field that distorts light and distance

Notes for the game master

The supplied Colossal size is represented with the 5e Gargantuan category; the worm occupies a 30-foot-by-30-foot space.
Aura of Distorted Space imposes a custom -2 penalty on melee attack rolls against the worm. This penalty is separate from the normal attack modifiers in 5e.
A creature swallowed by the worm is inside it, not inside an extradimensional space.
The worm's swallow effect has no saving throw on the initial bite, matching the requested behavior. Escape and regurgitation rules are included to make the effect usable in play.

Tactics

  1. Opening

    The worm senses the party through the stone and approaches unseen. It erupts from a wall or floor beside clustered creatures, then bites a likely threat before using its tail to scatter others.

  2. Mid-fight

    It alternates bites against isolated targets with tail sweeps that break formation. If creatures surround it, it burrows through the floor and attacks from a new angle.

  3. End of the fight

    When badly wounded, it uses Tail Sweep to scatter nearby foes, then slips through the rock toward a core-fissure. It may make one final bite against a creature separating from the group.

  4. Retreat

    It is not courageous or vindictive. If reduced below 60 hit points and unable to reach prey, it burrows away through solid material, leaving no passage behind.

How it fights

Use tremorsense to locate creatures through walls and approach without leaving a tunnel.
Prioritize creatures that are isolated, flying low, or standing beside an unstable fissure.
Use Tail Sweep to break up groups before biting a target it can swallow.
Burrow between attacks to reposition and force the party to watch both walls and floor.

Who it attacks first

Isolated creatures within reach
Creatures disrupting its approach or injuring it from range
Targets near a fissure or unstable footing

Works well with

Gravity-warping terrain can make its tail sweep and Gravity Snare more dangerous without increasing its damage.
Crystal ruins provide cover for the party and the worm, making positioning central to the encounter.
Other predators may follow its feeding grounds to scavenge prey or leyline-charged remains.

How to beat it

Force damage dealt from inside the worm can trigger its regurgitation response if the threshold is met.
Closing to within 20 feet removes the disadvantage imposed on ranged attacks by its distorted-space aura.
Teleportation can reposition a creature without traversing warped terrain, subject to the spell's normal restrictions.
A successful Strength check allows a swallowed creature to escape.

Ways to avoid a fight

It may be diverted by a strong vibration or a concentrated pulse of leyline energy.
It can be tracked indirectly through gravity anomalies and displaced crystal debris, despite leaving no trail.
A creature that remains still on stable ground may avoid attracting its attention, at the DM's discretion.

Ecology

A leviathan of overlapping obsidian-chitin plates forces its way through the deep stone without breaking it. Three concentric rings of crystalline teeth rotate inside its enormous maw, each ring turning at a different angle. Around its body, distance buckles: nearby crystals seem to lean closer, while the worm's far end appears impossibly distant. Its passing brings a dry mineral tang to the air, a low pressure in the ears, and a faint glassy ringing.

Behavior

A patient ambush predator, it detects vibrations and leyline changes through stone. It circles beneath prey, then attacks when their footing is compromised or they gather near a fissure. It rarely pursues prey far from unstable crystal formations.

How it lives

The worm feeds on creatures, leyline-charged minerals, and the energy released by unstable fissures. It leaves no tunnel, but its feeding grounds gather drifting shards, bent roots, and patches where gravity changes without warning. Its presence may indicate a disturbed leyline, though it does not understand the cause.

Lair

It lairs beneath the Graviton Trenches, near broad fissures where the Verdant Heart Nexus's gravity tilts and twists. It does not maintain a den; it rests within solid rock and slips away without leaving a trace.

Habitat
The Graviton Trenches and the surrounding deep reaches of the Verdant Heart Nexus, especially floating crystal ruins and unstable core-fissures.

Signs that it is near

Loose crystals drift sideways across otherwise stable ground.
A low ringing hum travels through stone and can be felt in the teeth.
Dust hangs in rotating bands around empty spaces.
Reflections in polished crystal show distances that do not match the room.

Tags

Verdara,
Verdant Heart Nexus,
Graviton Trenches,
gravity distortion,
burrowing leviathan

Lore

Deep delvers describe a pressure in the skull before the Graviton Void-Worm arrives. Its passage through the rock leaves no tunnel, only missing stone that seems to have been somewhere else for a moment. Scholars of the Verdant Heart Nexus disagree on whether it came from beyond Aethelia's planar boundary or emerged from an older, deeper fold in the world.

What drives it

Hunt, feed, and remain close to the gravity distortions that shelter it.

After the fight

When the worm dies, its singularity aura collapses with a sound like a deep bell heard underwater. Loose debris drops, crystal dust spirals inward, and the ground settles in a widening ring. For a few minutes, swallowed creatures and nearby objects drift toward the corpse before gravity steadies.

“Its passage through the rock leaves no tunnel, only missing stone that seems to have been somewhere else for a moment.”
From its lore

Variants

A wounded Void-Worm whose aura flickers, reducing its distorted-space radius to 10 feet.
A leyline-sated Void-Worm with crystal growths along its plates, increasing its hit points by 40 and its burrow speed by 10 feet.

Hooks

Plot hooks

A settlement's stable route through the Graviton Trenches has begun to tilt toward a deep fissure, and the worm's movements may be connected to a new surge in the Verdant Heart Nexus.
A crystal ruin is slowly drifting toward the abyss. The worm hunts beneath it, but an ancient structure within the ruin may be the true cause of the gravity shifts.
A delver claims to have survived inside the worm and returned with a shard marked by unfamiliar leyline patterns.

How to use it

Use it as a lair-scale predator crossing the party's route through the Graviton Trenches.
Build a fight around unstable footing, floating crystal debris, and gravity that shifts between areas.
Foreshadow it with pressure changes and distorted reflections before its first strike.
For a less lethal encounter, have it focus on dragging prey away rather than fighting to the death.

Treasure

Fragments of its crystalline teeth can be worked into gravity-sensitive instruments, though they lose their strange pull within days unless stabilized.
A nearby ruin or fissure may contain the true treasure, with the worm's corpse marking a dangerous route to it.

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