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Hearth-Quencher - AI-generated fantasy Monster

Hearth-Quencher

The Hearth-Quencher is a frost giant thrall altered by siphon-core technology. Each carries a command rune associated with Grand Archon Hjalmar Frost-Vein. The rune binds its loyalty, while the chest core draws warmth from its surroundings. The device's maker understood how to bind a giant, but whether the core is merely machinery or part of a larger design remains uncertain.

Monsters
Huge giant · CR 12 , 8,400 XP · Unique or rare construct-altered thrall

Hearth-Quencher

A frost giant thrall transformed into a mobile siphon engine, built to drain heat from a battlefield and punish attempts to destroy it carelessly.
AC17
HP230/230
CR12 , 8,400 XP
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 17 · HP 230 · CR 12 , 8,400 XP

Hearth-Quencher

Huge giant (frost giant thrall), neutral evil
Armor Class17 (natural armor and frost plating)
Hit Points230 (20d12 + 100)
Speed
Speed 40 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsConstitution
Immunities
Cold damage,
Charmed,
Frightened
Weaknesses
Fire damage vulnerability, applied after the reduction from Stolen Warmth.
Destroying its binding rune at the base of the neck renders it inert and prevents Cryo-Explosion.
Senses
Darkvision 120 ft.,
Passive Perception 11
Languages
Giant,
Common
Challenge12 , 8,400 XP
Initiative-1 (9)
Proficiency Bonus+4
Passive Perception11
RuneAC 19, 20 hit points; destroying it renders the Hearth-Quencher inert without triggering Cryo-Explosion.
Heat Drain Aura. At the start of each of the Hearth-Quencher's turns, each creature of its choice within 20 feet takes 10 () cold damage. The Hearth-Quencher gains 5 temporary hit points for each creature damaged this way, to a maximum of 30 temporary hit points per turn.
Cryo-Explosion. When the Hearth-Quencher dies while its binding rune remains intact, each creature within 30 feet must make a Constitution saving throw. On a failed save, a creature takes 22 () cold damage and is restrained by clinging black ice. A restrained creature can use its action to make a Strength check, ending the condition on itself on a success. On a successful save, a creature takes half as much damage and is not restrained. The area becomes difficult terrain until the next dawn. Destroying the binding rune before the Hearth-Quencher dies prevents this effect.

Actions

Multiattack. The Hearth-Quencher makes two Siphon-Core Slam attacks.
Siphon-Core Slam. Melee Weapon Attack: to hit, reach 15 ft., one target. Hit: 22 () bludgeoning damage plus 10 () cold damage.
Glacier Hurl. Ranged Weapon Attack: to hit, range 60/240 ft., one target. Hit: 28 () bludgeoning damage, and the target must succeed on a Strength saving throw or have the Prone condition.

Reactions

Stolen Warmth. When a creature the Hearth-Quencher can see within 30 feet deals fire damage to it, the Hearth-Quencher reduces that instance of damage by half, rounded down, and gains temporary hit points equal to the damage prevented. These temporary hit points can come only from this reaction and do not stack; use the higher amount. Fire vulnerability is applied after this reduction, as normal for the damage calculation.
Role
Boss-tier brute and environmental hazard
Built for
Approximately level 12; intended as a dangerous boss encounter for a party of four, with environmental stakes.

Gear

  • Siphon-core (Augmentation, Custom)A volatile device fused behind the breastbone, visible as a rhythmic blue glow through cracks in the giant's chest.
  • Binding rune (Control device, AC 19, 20 hit points)A command rune at the base of the neck. Destroying it disables the thrall and prevents its core from rupturing on death.

Augmentations

Siphon-core embedded in the chest, continuously drawing warmth from nearby creatures.
Frost plating fused to the skin and reinforced around the shoulders and forearms.
Binding rune carved at the base of the neck, keyed to the commands of Grand Archon Hjalmar Frost-Vein.

Notes for the game master

Custom D&D 5E creature, calibrated as a CR 12 encounter element.
Damage vulnerability to fire is retained. Stolen Warmth reduces one fire-damage instance before vulnerability is applied.
The binding rune is a separate target at the base of the neck. Destroying it disables the creature and suppresses Cryo-Explosion.
Temporary hit points from Heat Drain Aura are capped at 30 per turn.

Tactics

  1. Opening

    It advances toward the largest concentration of warm bodies, letting the aura begin to drain heat while it threatens the front line with long-reach slams.

  2. Mid-fight

    It uses its reach to punish anyone approaching the core, hurling a boulder or ice mass at creatures who stay beyond its aura. It angles toward clustered opponents to drain several at once.

  3. End of the fight

    If badly wounded, it tries to pin several foes inside the aura and force them to choose between finishing it and escaping the core's blast. It does not understand surrender.

  4. Retreat

    It does not retreat while the binding rune remains intact. If the rune is severed, it becomes inert and offers no resistance.

How it fights

Keep multiple targets within 20 feet to maximize the aura's pressure, but avoid wasting movement chasing a lone distant foe.
Use 15-foot reach to threaten characters who assume they are safe just beyond ordinary melee range.
Hurl debris at ranged attackers or anyone attempting to approach the neck rune.
Use Stolen Warmth against the most consequential fire attack each round.

Who it attacks first

Creatures clustering within its heat-drain radius.
Characters protecting a vent, siphon, or other heat source.
Anyone attempting to disable the binding rune.
Fire attackers whose damage threatens its core or control system.

Works well with

A controller or ranged support creature can keep the party occupied while the Hearth-Quencher presses into the frontline.
Cold terrain, narrow passages, and fragile heat sources heighten its area-denial role.
A nearby vent or warm-current conduit gives players a concrete environmental objective to defend.

How to beat it

Spread fire damage among multiple attackers or rounds. Its reaction can blunt only one instance of fire damage each round.
Use forced movement, cover, and spacing to keep fewer creatures inside its Heat Drain Aura.
Target the binding rune at the base of its neck. It has AC 19 and 20 hit points; destroying it renders the giant inert rather than triggering Cryo-Explosion.
Use non-fire damage and avoid clustering near the creature when its core is close to rupture.

Ways to avoid a fight

Characters who identify the neck rune can attempt to disable it rather than kill the giant.
The creature can be lured away from a vent or settlement with a strong, exposed heat source, if its controller has not given it a conflicting order.
A captured or disabled Hearth-Quencher can reveal clues about siphon-core construction and the chain of command behind its deployment.

Ecology

More than twenty feet tall, the giant bears frost-crusted skin split by seams of blue light. A siphon-core pulses behind its breastbone, each beat sounding like a hammer striking ice. At the base of its neck, a bright rune glows through a crust of frost. Its breath smells of iron and frozen seawater.

Behavior

The Hearth-Quencher advances with deliberate, grinding steps, drawn toward concentrations of warmth. It obeys commands encoded by its neck rune and attacks anything that shields heat or obstructs its route. It shows no fear, but its core pulses faster when struck by fire.

How it lives

Hearth-Quenchers are not a naturally occurring species. They are altered frost giants used as living heat sinks at glacial ridges, siphon works, and contested maritime facilities. Their cores consume ambient warmth, leaving thin ice across surfaces and weakening nearby vents.

Lair

Its usual staging ground is a siphon installation or a ridge overlooking a geothermal vent. The core's influence leaves frost-rimed machinery, brittle ropes, and a ring of pale ice around the site.

Habitat
Glacial ridges, siphon facilities, pressure-sealed works, and other sites where stolen geothermal heat is being collected or redirected.

Signs that it is near

A sudden crust of frost across warm metal, ropes, and exposed stone.
A low, regularly spaced thump audible through ice or hull plating.
Steam that curls toward a point and vanishes before reaching it.
Footprints rimmed in brittle blue ice.

Tags

giant,
frost,
thrall,
siphon-core,
boss,
area denial

Lore

The Hearth-Quencher is a frost giant thrall altered by siphon-core technology. Each carries a command rune associated with Grand Archon Hjalmar Frost-Vein. The rune binds its loyalty, while the chest core draws warmth from its surroundings. The device's maker understood how to bind a giant, but whether the core is merely machinery or part of a larger design remains uncertain.

What drives it

Obey its binding rune's commands and extinguish sources of warmth that obstruct the siphon's work.

After the fight

If the core ruptures, black rime crawls across the ground and muffles nearby sounds until the next dawn. If the binding rune is severed first, the giant collapses inert, its core dimming to a faint blue pulse.

“Each carries a command rune associated with Grand Archon Hjalmar Frost-Vein.”
From its lore

Variants

Winter Muster: Two Hearth-Quenchers enter at half hit points, and each Heat Drain Aura deals 7 (2d6) cold damage. Use with care, since their overlapping auras can create a severe encounter.
Deep-Pressure Quencher: The creature gains a swim speed of 30 feet and ignores environmental pressure effects. Replace Glacier Hurl with Freezing Surge: each creature in a 30-foot cone must make a DC 17 Dexterity saving throw, taking 27 (6d8) cold damage on a failed save or half as much on a success.

Hooks

Plot hooks

A Hearth-Quencher is draining heat from a facility that sustains a settlement, while its controller remains hidden.
The rune at its neck matches a mark found in a concealed laboratory connected to Hjalmar Frost-Vein.
A disabled giant begins to stir when its core responds to a distant pulse beneath the ice.

How to use it

Use as a CR 12 boss for a party of roughly four characters around level 12, adjusting for party strength and available healing.
Place it near a heat source, vent, or facility the characters need to protect, so its aura creates an immediate positional dilemma.
Make the neck rune visible early enough for observant characters to discover the nonlethal solution.
Warn players through rising core pulses and spreading cracks before the death burst, allowing a tactical response.

Treasure

The intact siphon-core can be recovered for study, though its pulse may attract attention from distant mechanisms.
The binding rune can provide evidence linking the creature to Hjalmar Frost-Vein's operations.
A nearby installation may contain stolen heat reserves, route records, or orders identifying the next target.

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