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Calcified Skin-Stalker - AI-generated fantasy Monster

Calcified Skin-Stalker

The Calcified Skin-Stalker is encountered in the Maw of Siss'tha, where serpent-kin shrines, dwarf workshops, and saurian ledge-camps crowd the sides of the subterranean rift. Some locals insist it forms wherever abandoned molts harden around old bones; others believe it is an ancient guardian whose purpose has outlasted its makers.

Monsters
Large construct and aberration · CR 11 (7,200 XP) · Uncommon

Calcified Skin-Stalker

A ceiling-clinging ambush construct or aberrant predator formed from serpent molts, calcified remains, and hardening resin in the depths of the Maw of Siss'tha.
AC18
HP189/189
CR11 (7,200 XP)
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 18 · HP 189 · CR 11 (7,200 XP)

Calcified Skin-Stalker

Large construct and aberration (dual type: construct and aberration), unaligned
Armor Class18 (natural armor)
Hit Points189 (18d10 + 90)
Speed
Walk 30 ft.,
Climb 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsConstitutionStrengthWisdom
SkillsStealthPerception
Damage Resistances
Bludgeoning, piercing, and slashing damage from nonmagical attacks
Immunities
Poison damage,
Poisoned condition
Weaknesses
Its camouflage is effective only among calcified rock or petrified skin-folds.
It cannot maintain its constricting molt-grip on more than one creature at a time.
Senses
Darkvision 60 ft.,
Tremorsense 30 ft.,
Passive Perception 14
Challenge11 (7,200 XP)
Hit Dice18d10
Initiative+1
Proficiency Bonus+4
Passive Perception14
Chitinous Camouflage. The Calcified Skin-Stalker has advantage on Dexterity (Stealth) checks made to hide among calcified rock or petrified skin-folds.
Ceiling Lurker. The Calcified Skin-Stalker can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Constructed Stillness. The Calcified Skin-Stalker does not require air, food, or sleep. Its alien instincts still draw it to prey and shelter.

Actions

Multiattack. The Calcified Skin-Stalker makes three attacks: two with its Petrified Rib-Scythe and one with its Constricting Molt-Grip.
Petrified Rib-Scythe. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 18 () slashing damage.
Constricting Molt-Grip. Melee Weapon Attack: to hit, reach 5 ft., one Large or smaller creature. Hit: 16 () bludgeoning damage, and the target is grappled (escape ). Until this grapple ends, the target is restrained and takes 14 () bludgeoning damage at the start of each of its turns. The Calcified Skin-Stalker can grapple only one creature at a time.
Role
Ambush predator and grappling controller
Built for
Approximately four characters of level 11; adjust for party size, resources, and terrain.

Notes for the game master

Custom creature using 5e-compatible terminology and mechanics.
The supplied Large Construct/Aberration description is represented as a dual creature type. It is both a Construct and an Aberration.
The supplied damage and grapple effects are retained. The grappled target is also restrained until the grapple ends.
If using strict 2024 rules, resolve escape attempts using the target's choice of Strength (Athletics) or Dexterity (Acrobatics) against DC 17.

Tactics

  1. Opening

    It waits upside down among calcified folds, then drops or glides into reach and attacks the creature most exposed beneath it.

  2. Mid-fight

    It alternates scythe strikes with its molt-grip, restraining a dangerous foe while using the other rib-legs to slash at nearby rescuers.

  3. End of the fight

    It drags a grappled victim toward a ceiling crevice or narrow shelf, forcing allies to choose between pursuit and keeping their footing. If badly damaged, it uses its reach to threaten pursuers while clinging overhead.

  4. Retreat

    It does not feel fear, but withdraws into tight fissures if its body is critically damaged or its hiding ground is destroyed.

How it fights

Use Chitinous Camouflage to begin hidden in an appropriate surface pattern.
Remain on ceilings or walls where melee attackers must spend movement to engage.
Use Constricting Molt-Grip against an isolated target, then scythe at nearby characters who try to intervene.
Avoid repeatedly restraining a character without giving the party meaningful chances to break the grapple.

Who it attacks first

A character moving alone beneath its hiding place.
A creature already injured or separated from allies.
Characters attempting to free its grappled prey.

Works well with

A narrow ledge or uneven terrace makes its reach and restraint more threatening, but leave clear routes for characters to reposition.
A second creature that pressures rescuers can make its grapple dangerous without increasing the Skin-Stalker's own damage.

How to beat it

Bright light and careful searching can expose it before it attacks.
Forced movement can pull it away from a ceiling or narrow ledge.
Allies can use the grapple's escape action or effects that remove the grappled condition to free its victim.
Ranged attacks and effects that target its hiding place can make its preferred ambush position unsafe.

Ways to avoid a fight

It can be diverted by leaving warm, freshly butchered meat on a route away from a settlement.
A character who studies its feeding trails can identify a safe passage through its hunting ground.
Its resinous shell may preserve fragments of markings or objects from creatures it has absorbed.

Ecology

A long, centipede-like assembly of petrified serpent molts, fused ribs, and amber-dark sap-resin. Dozens of hooked rib-legs grip stone without a scrape; beneath its plated folds, faint green light pulses like water seen through deep emerald glass.

Behavior

It remains motionless among the petrified folds until vibrations or warm breath reveal prey. Once it strikes, its rib-legs move in a precise ripple, and its resinous plates rasp softly against one another.

How it lives

It nests in shedding catacombs and abandoned shrines where petrified serpent molts collect. It feeds on creatures trapped in its grip and recycles mineral deposits, bone, and resin into its layered shell.

Lair

It clings to ceilings above terraces of petrified skin, near old shrines whose cracked stone catches the damp smell of sulfur and resin. Its hunting ground often overlooks emerald-lit water or a narrow drop.

Habitat
Underground, especially the shedding catacombs, petrified skin-fold terraces, and ruined shrines of the Maw of Siss'tha in Verdara.

Signs that it is near

Fine, crescent-shaped gouges high on the walls and ceiling.
A resinous mineral smell mixed with sulfur and damp stone.
Small bones fused into translucent amber-brown deposits.
A sudden absence of cave vermin around ceiling folds.

Tags

Verdara,
The Maw of Siss'tha,
Underground,
Ambusher,
Grappler,
Custom monster

Lore

The Calcified Skin-Stalker is encountered in the Maw of Siss'tha, where serpent-kin shrines, dwarf workshops, and saurian ledge-camps crowd the sides of the subterranean rift. Some locals insist it forms wherever abandoned molts harden around old bones; others believe it is an ancient guardian whose purpose has outlasted its makers.

What drives it

It seeks warmth, movement, and living prey, responding to vibration and breath rather than allegiance or command.

After the fight

When its core finally cracks, the creature slumps into a brittle heap of ribs and resin. Dust drifts through the chamber as trapped air escapes the hollow molts with a thin, flute-like whistle.

Variants

A brittle-molt specimen has AC 16 and 150 hit points, but its rib-scythes deal an extra 4 (1d8) damage on its first turn from an ambush.
An aquifer-fed specimen has emerald resin veins and tremorsense out to 60 feet, but is reluctant to leave damp stone.

Hooks

Plot hooks

A workshop crew has vanished from a terrace where fresh rib-shaped scratches now cross the stone.
A ruined shrine's blocked entrance must be reached, but the creature has made the ceiling above the only safe approach its hunting perch.
A local guide claims the creature's resin contains an old seal-mark needed to settle a disputed claim over a nearby aquifer.

How to use it

Use it as a solo ambusher in a chamber with ceilings, pillars, and multiple routes of approach.
Give characters clues to its presence before initiative, rewarding investigation and cautious movement.
For a more dangerous set piece, pair it with unstable ledges or an aquifer channel, while ensuring the party has ways to escape a grapple.

Treasure

A fist-sized piece of amber-dark resin worth 150 gp to a collector or artisan.
Fragments of old shrine ornament or workshop tools embedded in the shell.
A mineralized scale etched with a local claim-mark, potentially relevant to the region's contested aquifers.

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