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The Ruby Sootbound - AI-generated fantasy Monster

The Ruby Sootbound

The Ember Gate ward was designed to redirect dangerous magical heat and psychic strain into sealed anchor stones beneath the district. Officials quietly overcharged the system to power the city's crimson spires and industrial furnaces. The ward began collecting fear from workers, merchants, performers, and displaced citizens. The horror emerged when one anchor cracked and the accumulated emotional pressure found a shape in ruby glass.

Monsters
Large fiend · High · Unique

The Ruby Sootbound

A sootbound nightmare born when Ember Gate's failing ward compressed the district's suppressed fear, overheated magic, and collective exhaustion into one predatory reflection-walker.
AC16
HP136/136
CRHigh
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 16 · HP 136 · High

The Ruby Sootbound

Large fiend (fiendish magical manifestation), neutral
Armor Class16
Hit Points136 (16d8 + 64)
Speed
30 ft.,
Climb 30 ft.,
Fly 30 ft. while moving through a reflection
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsDexterityWisdomCharisma
SkillsDeceptionInsightPerceptionStealth
Damage Resistances
Cold,
Fire,
Lightning,
Necrotic,
Psychic,
Bludgeoning, piercing, and slashing damage from nonmagical attacks
Immunities
Frightened,
Poison damage,
Poisoned condition
Weaknesses
Radiant damage prevents Ward-Bound Regeneration until the end of the horror's next turn.
The ward bell can disrupt its form when rung by someone who knows the district's founding name.
It cannot cross a circle drawn with ash from a voluntarily surrendered nightmare.
A sincere public confession about the ward's abuse weakens its Shared Nightmare, reducing its damage by 1d10 for the remainder of the encounter.
Senses
Darkvision 120 ft.,
Truesight 30 ft. while within 30 feet of a reflective surface,
Passive Perception 16
Languages
Common,
Infernal,
Telepathy 120 ft. with frightened creatures
ChallengeHigh
Proficiency Bonus+3
Spell Save DC16
Spell Attack Bonus+8
Experience3,900 XP
Magic Resistance. The horror has advantage on saving throws against spells and other magical effects.
Sootbound Form. The horror cannot be frightened. It can move through the spaces of other creatures, though it cannot end its movement there.
Nightmare Harvest. Whenever a creature within 60 feet becomes frightened, the horror gains 5 temporary hit points, up to a maximum of 20 temporary hit points. This benefit does not trigger from the horror frightening itself or from the same creature more than once per round.
Ruby Surveillance. The horror can see and hear through any reflective surface within 120 feet. It has advantage on Dexterity (Stealth) checks made in dim light, smoke, or a crowd.
Ward-Bound Regeneration. While within 30 feet of an active ward anchor, the horror regenerates 10 hit points at the start of its turn. It does not regenerate if it took radiant damage since the end of its last turn or if the anchor has been disabled.
Voice Beneath the Soot. The horror can communicate telepathically with any frightened creature within 120 feet, even if that creature does not share a language. It may project one memory or nightmare image at a time.

Spells

Minor Illusion (cantrip, illusion). The horror creates a harmless but disturbing sensory illusion, usually a reflection of an absent person or a crowd screaming silently behind glass.
Invisibility (level 2, illusion). The horror can obscure itself among lantern light, smoke, and reflections, gaining advantage on its next Dexterity (Stealth) check.
Fear (level 3, illusion). The horror magically frightens one creature that can see it within range. The target must make a Wisdom saving throw.
Dream (level 5, illusion). The horror magically links the dreams of nearby creatures, using the spell's effect as a narrative manifestation of its Shared Nightmare ability.

Actions

Multiattack. The horror makes two attacks, using Emberglass Claw or Nightmare Lance in any combination.
Emberglass Claw. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 13 () slashing damage plus 7 () psychic damage. If the target is frightened, it must succeed on a Wisdom saving throw or have its speed reduced to 0 until the end of its next turn.
Nightmare Lance. Ranged Spell Attack: to hit, range 120 ft., one target. Hit: 18 () psychic damage, and the target cannot benefit from invisibility until the end of its next turn. The lance visibly travels through the nearest ruby glass reflection.
Shared Nightmare. The horror targets up to three creatures it can see within 60 feet. Each target must make a Wisdom saving throw. On a failed save, a creature takes 22 () psychic damage and is frightened for 1 minute. On a successful save, it takes half damage and is not frightened. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Dreamstep. The horror chooses one creature within 60 feet that is frightened, incapacitated, or asleep. The target must make a Charisma saving throw. On a failure, the horror teleports into the target's space, the target takes 14 () psychic damage, and the horror gains 10 temporary hit points. On a success, the target takes half damage and the teleport fails. The horror cannot use this action again until the start of its next turn.
Between Reflections. The horror moves into a reflective surface it can see within 60 feet, disappearing from its current space. At the start of its next turn, it emerges from another reflective surface within 120 feet. This movement does not provoke opportunity attacks. If no suitable reflection exists, the horror instead becomes invisible until the end of its next turn.

Reactions

Panic Feeds Panic. When a creature the horror can see within 60 feet fails a saving throw against being frightened, the horror moves up to 15 feet without provoking opportunity attacks. It can move through a creature's space during this movement, treating that space as difficult terrain.

Legendary Actions

Claw or Slip. The horror makes one Emberglass Claw attack or uses Between Reflections.
Whisper Through Glass (costs 2 actions). One frightened creature within 60 feet must succeed on a Wisdom saving throw or take 9 () psychic damage and lose its reaction until the end of its next turn.
Echoed Panic (costs 3 actions). The horror uses Shared Nightmare, but it can target only two creatures. A creature that fails the save is also pushed up to 10 feet in a direction of the horror's choice.
Role
Solo controller, ambusher, urban stalker
Built for
Four characters of level 8

Gear

  • Cracked Ruby Lantern (Arcane focus, 250 gp, or priceless to ward investigators)A cracked ruby lantern containing a captive ember that glows brighter near frightened creatures.
  • Ward-Anchor Token (Quest item, Worth 100 gp to officials, or evidence of magical abuse)A brass token stamped with the sigil of the Ember Gate ward authority. It is warm to the touch and bears evidence of magical overuse.
  • Illicit Dream-Ash (Alchemical reagent, 400 gp to an underground buyer, dangerous to handle)A pouch of gray-black dream-ash recovered from consumed nightmares.

Feats

Frightful Presence
Magic Resistance
Mobile Ambush
Reflective Teleportation

Notes for the game master

This monster is calibrated as a dangerous encounter for four characters of approximately 8th level.
The horror gains one Ward Surge after each full day the party delays or after another ward anchor fails. Each Ward Surge grants it 10 temporary hit points and increases the range of Shared Nightmare by 10 feet, to a maximum of three surges.
If the party severs its nightmare supply, remove all Ward Surge benefits and prevent it from gaining temporary hit points from Dreamstep.
In the bell chamber, the party can use an action to disable a ward anchor with a successful DC 16 Arcana, Religion, or thieves' tools check. Three successes weaken the horror. Three failures trigger a ward backlash, dealing 10 (3d6) force damage to each creature in the chamber.

Tactics

  1. Opening

    The horror begins hidden inside a ruby lantern, a shop window, or a polished brass display. It opens with Shared Nightmare against the largest cluster of creatures, then uses Between Reflections to separate the party from civilians.

  2. Mid-fight

    It alternates between Shared Nightmare and mobility through reflective surfaces, isolating frightened targets and striking spellcasters or characters carrying ward components. It uses nearby crowds, furnace vents, hanging lanterns, and glass displays as cover and escape routes.

  3. End of the fight

    When reduced below 35 hit points, the horror uses Dreamstep to reach the ward's nearest anchor or a vulnerable witness. It attempts to consume one final burst of nightmare energy, gaining advantage on its next Shared Nightmare, then either fights to the death or offers a bargain involving stolen memories.

  4. Retreat

    The horror retreats if the party severs its nightmare supply, destroys three ward anchors, or reduces it below 20 hit points while it has no frightened target nearby. It is not suicidal. It seeks the bell chamber, a crowded festival, or the nearest active ward anchor.

How it fights

Open with a fear effect against clustered targets.
Use reflections to appear behind isolated characters, then retreat before being surrounded.
Prioritize frightened creatures, spellcasters, ward investigators, and anyone carrying evidence.
Use civilians as emotional pressure without deliberately killing them unless the party abandons the district.
In a foundry, manipulate steam, soot, polished tools, and molten channels to create confusing sightlines.
Never remain in one location for more than one round unless it is protecting an anchor or consuming nightmare energy.

Who it attacks first

Frightened creatures
Spellcasters concentrating on protective magic
Characters carrying ward-anchor tokens or evidence
Influential witnesses who understand the district's magical infrastructure
Isolated characters separated from the group

Works well with

Crowd-control enemies benefit from the panic created by Shared Nightmare.
Fire-based hazards can herd characters toward reflective surfaces, but should not directly empower the horror unless the ward is failing.
A rival manifestation can create new reflections or seal escape routes, turning the encounter into a three-sided conflict.
An NPC carrying ward evidence can serve as a tempting target and a source of clues.
Bell-based or resonance-based magic can disrupt the horror's movement and expose its true location.

How to beat it

Bright, unbroken daylight or magical light suppresses Between Reflections within its area.
Covering or shattering nearby reflective surfaces limits its teleportation routes.
Calm emotions, protection from fear, and effects that remove the frightened condition reduce its access to temporary hit points.
Exposing the ward's connection and severing its nightmare supply can weaken or banish it without killing it.

Ways to avoid a fight

Bargain with the horror by offering a cherished memory, a name erased from official records, or the truth about the ward.
Lure it into the bell chamber and ring the ward bell while three anchors are simultaneously disconnected.
Expose its connection to the ward before witnesses, causing the crowd's fear to shift from panic to outrage and reducing its available nightmare energy.
Use dream magic or a willing victim's memory to communicate with the consciousness buried beneath the soot.

Ecology

A tall, gaunt figure assembled from black soot, overheated brass, and strips of crimson shadow. Its head is a faceted ruby lantern with no flame inside, only a swirling human eye. Missing shadows cling to its limbs like torn cloth, while ember symbols crawl across its chest and palms. In reflective glass, it appears as a crowd of terrified citizens pressed together beneath a burning sky.

Behavior

It stalks emotional pressure rather than individual prey. It prefers crowded places where one person's panic spreads through many minds, and it avoids quiet rooms with no reflective surfaces. It repeats phrases overheard from victims, imitates trusted voices, and sometimes pauses when confronted with a memory it does not understand.

How it lives

The horror is not a natural species. It is a self-sustaining magical pressure system that feeds on shared nightmares, denial, and the psychic residue of abused ward magic. It becomes more coherent around crowds, furnaces, bells, and ruby glass.

Lair

The horror's lair is the Ember Gate ward's bell chamber, where cracked rune-pillars surround a suspended iron bell. Every failed anchor causes the chamber to fill with soot, duplicate echoes, and false reflections. At initiative count 20, one visible reflection within the chamber shows a horrifying memory. Each creature that sees it must succeed on a DC 16 Wisdom saving throw or become frightened until the end of its next turn.

Habitat
Urban markets, foundries, bell towers, arcane districts, crowded festivals, and alleys lined with polished metal or colored glass.

Signs that it is near

Merchants repeat the same sentence in unison, then deny having spoken.
Lanterns cast shadows in the wrong direction or fail to cast shadows at all.
Impossible footprints appear in soot, leading vertically up walls or ending inside sealed glass.
Victims awaken with ember symbols burned into their palms and no memory of their dreams.
Reflections show crowds that are not present, all staring toward the same alley.
Hot metal cools instantly when the horror passes, leaving hand-shaped frost on the surface.

Tags

urban horror,
reflection walker,
nightmare feeder,
ward manifestation,
crimson city,
solo monster,
controller,
investigation encounter

Lore

The Ember Gate ward was designed to redirect dangerous magical heat and psychic strain into sealed anchor stones beneath the district. Officials quietly overcharged the system to power the city's crimson spires and industrial furnaces. The ward began collecting fear from workers, merchants, performers, and displaced citizens. The horror emerged when one anchor cracked and the accumulated emotional pressure found a shape in ruby glass.

What drives it

It wants relief from the pain and noise trapped inside it. It feeds because feeding briefly quiets the nightmares. It is hostile, but it may accept memories, the removal of a ward anchor, or a promise to expose the officials who created it.

After the fight

When the horror is defeated, the Ember Gate ward briefly stabilizes. The burned symbols on victims' palms fade into harmless gray ash, but each victim loses one minor nightmare or repressed memory. If the party exposed the ward's abuse, public unrest follows. If they bargained with the horror, it dissolves into soot and ruby sparks, leaving behind the memories it consumed and a warning that another manifestation is forming elsewhere in the city.

“Officials quietly overcharged the system to power the city's crimson spires and industrial furnaces.”
From its lore

Variants

Ashen Reflection: Replace fire resistance with immunity and reduce hit points to 120.
Festival Incarnation: Increase Shared Nightmare's range to 90 feet and give the horror one additional legendary action each round, but make three ward anchors visible and vulnerable.
Starved Manifestation: Remove Ward-Bound Regeneration and Nightmare Harvest. The horror loses 20 hit points but becomes desperate to bargain.
Bell-Broken Horror: The horror has advantage on attacks in the bell chamber, but each toll of the ward bell deals 10 thunder damage to it and suppresses Between Reflections until the next round.

Hooks

Plot hooks

NPC 1, an official responsible for Ember Gate security, wants the attacks hidden until the festival ends and may order the party to destroy evidence.
NPC 2, a magical researcher or dissident engineer, sees the horror as proof that the district's ward has been abused and overloaded for years.
NPC 3, an illicit alchemist, offers payment for dream-ash harvested from the horror, encouraging the party to weaken rather than destroy it.
Monster 1 is a rival manifestation created by the same broken ward system. The two entities compete for nightmare energy and may attack one another if brought together.
Each missing ward anchor creates another public incident, forcing the party to choose between pursuit, investigation, and civilian rescue.

How to use it

Use it as the immediate escalating threat in the Ember Gate District.
Have it attack during a public festival while terrified civilians amplify Shared Nightmare.
Let it pursue the party through a foundry, using molten channels and polished machinery as reflection gates.
Allow it to possess an influential witness for one scene, speaking through the witness before emerging as a separate entity.
Track each delayed ward failure as a boon such as temporary hit points, increased range, or an additional reflection route.

Treasure

Cracked ruby lantern worth 250 gp to an arcane collector.
Three doses of illicit dream-ash, each usable as a reagent for divination or nightmare magic.
A ward-anchor token containing the official sigil and enough magical residue to prove the district's infrastructure has been abused.
A stolen memory sealed in ruby glass. Returning it to its owner may reveal a major secret.

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