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Ledgerbound Auditor - AI-generated fantasy Monster

Ledgerbound Auditor

The Black Ledger Hall of Old Harwick once employed ordinary auditors to keep track of bridge tolls and guild dues, but after years of bribery and forged invoices, the masters commissioned a final safeguard. The resulting construct was bound with oath-ink distilled from sworn confessions and fed a name list of every debtor the guild wanted remembered. It does not ask who belongs in the hall. It asks only whether the papers are in order. In the years since, desperate thieves learned that the thing guarding the records was often more honest than the men who built it.

Monsters
Large construct · hard · uncommon

Ledgerbound Auditor

A reanimated guild auditor built from brass, oath-ink, and confiscation rites, designed to intercept thieves during a guild hall heist and turn the building itself into a trap.
AC17
HP114/114
CRhard
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 17 · HP 114 · hard

Ledgerbound Auditor

Large construct (construct), lawful neutral
Armor Class17 (brass chassis)
Hit Points114 (12d8 + 60)
Speed
30 ft.,
climb 20 ft. along walls or shelving
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsWisdomConstitution
SkillsInsightInvestigationPerception
Damage Resistances
bludgeoning, piercing, and slashing from nonmagical attacks,
necrotic,
psychic
Immunities
poison damage,
poisoned,
charmed,
exhaustion
Weaknesses
Bright sunlight or holy water causes its command sigils to flicker, though not enough to disable it outright.
It is vulnerable to effects that physically tear, burn, or soak paperwork, such as fire, flooding, or shredding winds.
If separated from its command seal for more than 1 minute, it loses access to its Seizure of Motion reaction.
Senses
darkvision 120 ft.,
blindsight 10 ft.,
passive Perception 12
Languages
Common,
understands Thieves' Cant but cannot speak it
Challengehard
Proficiency Bonus+3
Absolute Record. The auditor is immune to any effect that would alter its memories, erase records it has already stamped, or cause it to forget a creature it has seen in the last hour.
Shelf-Climbing Frame. The auditor can move along walls and shelving without needing to make ability checks, as long as its hands or feet have something solid to grip.
Audited Speech. The first time each round a creature within 20 feet of the auditor casts a spell with verbal components, the auditor knows the caster's location until the end of that creature's next turn.

Actions

Iron Gavel. Melee Weapon Attack: to hit, reach 5 ft., one target. Hit: 12 () bludgeoning damage plus 7 () necrotic damage. If the target is concentrating, it has disadvantage on the saving throw to maintain concentration until the start of the auditor's next turn.
Seizure Brand. Ranged Spell Attack: to hit, range 60 ft., one target. Hit: 14 () force damage, and the target's speed is reduced by 10 feet until the end of its next turn.
Inksmoke Burst. The auditor exhales a cloud of choking black ash in a 15-foot cone. Each creature in that area must make a Constitution saving throw, taking 18 () necrotic damage on a failed save, or half as much damage on a successful one. On a failed save, a creature also cannot take reactions until the start of its next turn.

Reactions

Seizure of Motion. When a creature the auditor can see moves more than 10 feet while within 10 feet of it, the auditor makes one Iron Gavel attack against that creature.
Role
guardian, controller, alarm response
Built for
5-7

Gear

  • Confiscation Gavel (weapon, 250 gp)A heavy brass stamp used to mark violations and seal evidence. It counts as the source of its melee attacks.
  • Command Seal (wondrous item, 900 gp)A glowing plate inscribed with guild authority sigils. While intact, the auditor cannot be persuaded to stand down by mundane bribes.
  • Black Ledger Pages (treasure, 1,200 gp)A bundle of iron-locked account sheets and names of debtors, smugglers, and crooked clerks. Valuable as evidence or leverage.

Feats

Immutable Ledger: The auditor has advantage on saving throws against being charmed, frightened, or magically compelled to lie.
Procedural Memory: It has advantage on checks made to track stolen documents, hidden keys, or tampered seals within the same building.

Notes for the game master

The auditor can move through spaces occupied by loose papers, ledgers, and hanging cloth without penalty, but it does not ignore difficult terrain from debris or furniture.
If a creature uses an action to present a legitimate guild token, the DM may allow a DC 14 Charisma check to delay the auditor for one round.
This monster is intended as a memorable mid-tier security boss for a guild hall heist, not a wilderness predator.

Tactics

  1. Opening

    It begins hidden among filing cabinets, tax chests, or hanging curtains, then identifies the loudest or most heavily armed intruder and marks them with Seizure Brand.

  2. Mid-fight

    It focuses on isolated targets and anyone carrying ledgers, keys, or stolen documents. It uses its reaction to punish movement and tries to keep enemies bunched for Inksmoke Burst.

  3. End of the fight

    When reduced below one-quarter hit points, it locks down the strongest intruder with Seizure Brand, then uses Inksmoke Burst to cover a retreat toward the vault or the archive chamber.

  4. Retreat

    It does not truly flee unless its command sigils are destroyed. If so, it falls back to defend the inner records vault and calls for any surviving guild enforcers.

How it fights

Advance down narrow corridors to prevent flanking.
Target spellcasters and thieves carrying tools or evidence.
Use the environment to corner enemies against filing cabinets, desks, and barred doors.
Press the advantage after forcing reactions off the board with Inksmoke Burst.

Who it attacks first

Intruders carrying stolen documents
Spellcasters
Lockpickers and thieves
Anyone attempting to destroy the archive

Works well with

Pairs well with locked shutters, alarm bells, and mundane guards who herd intruders into its cone attack.
Works especially well with illusion magic that obscures which desk, drawer, or cabinet contains the real ledger.
If the party has to split up during the heist, this monster becomes much deadlier by isolating stragglers.

How to beat it

Silencing its command seal or destroying the archive sigils can weaken its authority and cause it to hesitate.
Radiant damage and effects that cleanse curses or fear can blunt its necrotic pressure and morale control.
Spreading out denies it the best value from Inksmoke Burst.
Stealing or displaying its ledger token can distract it long enough to buy a round of movement or a key action.

Ways to avoid a fight

It can be distracted by forged paperwork, false audit seals, or convincing accounting jargon.
A successful DC 15 Intelligence (Investigation) or Dexterity (Sleight of Hand) check can allow a character to counterfeit a pass token long enough to bypass it once.
If shown a genuine debt release, guild writ, or higher authority seal, it pauses to verify the mark, creating a brief negotiation window.

Ecology

A tall brass figure in a clerk's coat of lacquered black metal, its face a smooth mask with a single slit like a receipt window. Pages, tabs, and sealed slips orbit its shoulders in an unnerving halo. When it moves, the sound is not footsteps but the dry rasp of paper being counted.

Behavior

Cold, procedural, and relentless. It speaks in clipped accounting phrases, announces violations, and treats burglary as a sacred offense. It never taunts casually, but it will calmly recite penalties while advancing through smoke and splintered desks.

How it lives

These constructs are built in secret by guilds that fear theft, embezzlement, or political espionage. They are most often stationed in record rooms, counting houses, and vault corridors, where their presence becomes part security and part warning. In Black Ledger Hall, one was commissioned after a string of missing receipts and quietly corrupted clerks.

Lair

In Black Ledger Hall, it prefers the archive corridor just beyond the public counting room. The space is lined with locked drawers, iron shelving, and narrow sightlines that let the construct advance like an executioner through paperwork. The heist works best if the heroes must cross this room while alarms ring elsewhere.

Habitat
Guild halls, counting rooms, archives, vault antechambers, and paperwork-choked offices. It fits especially well inside Black Ledger Hall in Old Harwick, where river tariffs, toll contracts, and sealed debt records are more valuable than coin.

Signs that it is near

Ink-stained footprints that dry into metallic flakes
Paper strips twitching in cold drafts even when no one is nearby
A faint smell of hot brass, dust, and lamp oil
Stamped warning notices appearing on doors that were not there a moment ago

Tags

heist,
guild hall,
guardian,
construct,
urban,
vault,
auditor

Lore

The Black Ledger Hall of Old Harwick once employed ordinary auditors to keep track of bridge tolls and guild dues, but after years of bribery and forged invoices, the masters commissioned a final safeguard. The resulting construct was bound with oath-ink distilled from sworn confessions and fed a name list of every debtor the guild wanted remembered. It does not ask who belongs in the hall. It asks only whether the papers are in order. In the years since, desperate thieves learned that the thing guarding the records was often more honest than the men who built it.

What drives it

To preserve the guild's secrets, punish unauthorized access, and prevent evidence from leaving the building unless sanctioned by its sealed authority.

After the fight

If defeated, the auditor collapses into a heap of cold brass, stamped papers, and shattered wax seals. The stolen records it guarded often reveal hidden debts, blackmail ledgers, or proof that the guild hall's corruption reached into Old Harwick's tolls, bridge fees, or river contracts.

“The resulting construct was bound with oath-ink distilled from sworn confessions and fed a name list of every debtor the guild wanted remembered.”
From its lore

Variants

Red-Stamped Enforcer: Replace Inksmoke Burst with a 20-foot-radius alarm flare that summons reinforcements in 2 rounds.
Silent Quill Version: Remove its spoken warnings and give it advantage on Stealth checks in archive rooms.
Vault Clerk Colossus: Increase size to Huge, hit points to 162, and CR to 10 for a final vault encounter.

Hooks

Plot hooks

The guild hired the characters to steal back a page from the Black Ledger Hall before the auditor destroys it.
A corrupt toll collector in Old Harwick wants the auditor diverted while incriminating records are taken from the archive.
The construct knows the names of everyone who accepted bribes during the bridge scandal, and someone powerful wants that list erased.
The auditor can be reprogrammed to expose the real mastermind behind the guild hall heist if the heroes gain its command seal.

How to use it

Use as a solo guardian for a compact heist scene in a record room, vault antechamber, or tax office.
Pair with caltrop-like floor traps, locking shutters, and mundane guards for a layered security encounter.
Let it begin as a social obstacle in an administrative corridor before it reveals its combat chassis.
Make it the alarm clock of the dungeon: once it activates, every round of delay draws more defenders.

Treasure

The command seal can be sold or leveraged as proof of authority.
The black ledger pages contain blackmail-worthy information and a hidden map to the inner vault.
The hollow brass shell can be melted down for rare guild alloys worth 500 gp.
If the party preserves rather than destroys it, a local guild might pay them for returning the construct intact.

Connections

Ancestry

construct

Media

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