Long Island Dungeon Master · A Creature Keeper

The Ledgerworm

It arrives with a bill, not a bite.

A long pale segmented worm coiled around a mountain of old ledgers and torn contracts in a dark counting-house

The Ledgerworm eats debts. Not the debtors: the debts. It swallows the paper a loan is written on, parchment and wax and signatures and all, and the debt transfers to the worm. It has been doing this for centuries. By now it is owed nearly everything, it never forgets, and it has never once been in a hurry.

It arrives announced: a tremor under the floorboards, a dry voice like a quill on a slow day, and an itemized bill presented with terrible courtesy. Somebody in your party is holding a marked coin, and the debt follows the coin. They will learn both of these facts from line one, in perfect clerk's hand. And no, a segmented worm has no hands to write with: it does not keep a ledger so much as it is one, its accounts inscribed across its own chitin, and a debt it holds simply writes itself onto the debtor's world. The perfect penmanship is the debt asserting itself, not the worm's.

This is a free monster, and a negotiation wearing a stat block: fighting it is the deadly option, and it would much rather talk. Everything on this page is table-ready, and the whole file loads into Gnasher's Grimoire as a Creature Keeper: the worm, the bill, the tables, the notary, all of it.

Field Notes

how to run a monster that knocks

Gnasher's Take

Most monsters announce themselves with screaming. This one uses paperwork. Post the first notice a full session early: nail it to the inn door and let the party laugh at it. The second notice has a bigger number. The third has a time. By the hour the floor finally hums they will be checking their own pockets, and THAT, fellow predators, is the whole meal. Stay hungry.

How to run it

The plain-English version: a debt-collector kaiju that would rather settle than fight. The bill is the encounter; the stat block is what happens when the table forgets that.

Flip for the six-beat breakdowntap to flip

The coin. Seed it early, ideally a session before: roll How the Marked Coin Reached the Party. The debt follows the coin, and whoever holds it is the debtor of record. Passing it on passes the debt; that out is real, and it is theirs to live with.
The paper trail. Escalate with Notices and Escalations. Never rush this. The dread is in the arithmetic.
The arrival. Roll Where It Corners You. It surfaces announced and presents THE BILL, scaled to your table (about half the party's liquid gold; see below). The default for a level-4 group is 2,500 gp, itemized: 250 principal and 750 fair interest (both provable), plus three padded 500 gp lines. The honest floor after contesting all three is 1,000 gp.
The negotiation IS the encounter. Four outs, each ends the scene: contest a padded line (Insight or History DC 15, once per line per PC; Fennick's testimony grants advantage), covenant (Persuasion DC 15: installments within 30 days, or one service-quest of its choosing), transfer (hand the coin on, no check), or settle (pay the standing bill; it returns any excess it repossessed and leaves forever). It appraises goods honestly, keeps its word to the letter, and opposes lies with Insight +6.
If swords come out. Round 1 it recites: Notice of Arrears, DC 14 Wisdom, chosen targets frightened. Round 2 on, it coils the coin-holder and converts its Bite to Repossess whenever something valuable is in reach. It stops attacking the instant genuine negotiation resumes.
It never dies angry. At 52 HP or fewer it burrows out: the bill stands, it returns, and it no longer parleys with whoever attacked it. Kill it and the account does not close: an older worm, the Estate, eventually inherits the claim. Book the sequel only if your table earns it.

The win condition is a signature, not a corpse. The damage is real, but every mechanic points the same direction: you cannot scare it, charm it, outrun it, or profitably kill it. You can only settle.

The Tables

roll the coin, the notices, and the venue

How the Marked Coin Reached the Party (d8)
1	Change from a nervous merchant who counted it out too fast and did not meet anyone's eyes.
2	Inside the strongbox they looted three sessions ago. It has been theirs for weeks already.
3	Payment from a grateful NPC who smiled too much on the way out.
4	A dead man's purse on a battlefield they picked over. He was facing away from the fighting.
5	A pawnshop bargain that was cheap for a reason the pawnbroker would not discuss.
6	The reward purse from a lord who knew exactly what he was handing them.
7	Won at dice from a stranger who left too quickly and far too happily.
8	Pressed into a PC's hand by Fennick Sorrel himself, 'for luck.' He meant it as an apology.

Notices and Escalations (d10)
1	A bill nailed to the inn door, itemized, in perfect clerk's hand. The sum is absurd. The signature is a spiral.
2	The innkeeper slides their coin back across the bar. 'Can't take that one. It's garnished.'
3	A dry voice from a storm drain, reciting a running total to itself, patiently.
4	The ground trembles exactly at the edge of town, and stops, as if observing a boundary.
5	A second notice, the sum larger. A new line reads 'costs of collection.'
6	Every shop they visit today demands exact change from them, apologizing, unable to say why.
7	A local debtor points them out in the street to his family, visibly relieved it is not him today.
8	By morning there is a neat bored hole up through the common-room floor. Nothing was taken. An inspection visit.
9	A final notice, edged in red wax, naming the hour.
10	The floor of the room bulges, politely, and waits to be acknowledged.

Where It Corners You (d6)
1	The toll bridge, with a coil blocking each end. It waits for them to reach the middle.
2	The counting-house floor, which it owns outright through foreclosure. It is very much at home.
3	The harbor gangplank at departure, rising out of the water between ship and shore.
4	The market square at noon, with an audience of locals who all owe it something and want to watch someone else pay.
5	The bank vault it is legally entitled to enter. The manager let it in. The manager apologizes constantly.
6	The party's own rented room, up through the floorboards, holding the itemized bill at eye level.

Who it’s for. The Ledgerworm is CR 6 (2,300 XP): deadly for four 3rd- or 4th-level PCs, a hard slog at 5th. But its budget is directional, not just arithmetical: the fight, even won, cannot close the account; only the negotiation can, and the negotiation is level-appropriate at every level. Scale the pressure with the bill, not the hit points: a richer party meets an older debt.

The Stat Block

one whole monster, free, forever; it prefers not to use it

An original creature, compatible with fifth edition, built as a solo social predator. Drop this file onto the Grimoire and the worm takes its seat on the War Table: two real attacks, the full collection loop in its notes, and all three tables load into the Summon.

The Bill, as presented (scale it to your table): the worm asks for what stings, never what is impossible, so set the demand to the party in front of you: roughly half their liquid gold. Whatever the total, the provable floor is about 40% (principal + fair interest, which cannot be contested away) and the other ~60% is three padded lines the party strikes one at a time (Insight or History DC 15). The worked default for a mid level-4 group: 2,500 gp demanded (250 gp principal + 750 gp fair interest + three padded 500 gp lines for "costs of collection," "hazard and travel fees," and "instrument storage"), an honest floor of 1,000 gp. A richer party simply meets an older debt.

The Ledgerworm

Huge monstrosity, lawful neutral

Armor Class 15 (clerk-gray chitin plates)Hit Points 105 (10d12 + 40)Speed 30 ft., burrow 20 ft.

STR18 (+4)

DEX6 (-2)

CON18 (+4)

INT14 (+2)

WIS16 (+3)

CHA16 (+3)

Skills History +5, Insight +6, Intimidation +6, Perception +6

Condition Immunities charmed, frightened (you cannot sweet-talk or scare a ledger)

Senses tremorsense 60 ft., passive Perception 16

Languages Common

CR 6 (2,300 XP) · Proficiency Bonus +3

Vault-Gullet. Items the worm swallows with Repossess are held unharmed in an armored inner vault. They can be retrieved if the worm releases them (a renegotiation or a settlement), or cut free from its corpse with 1 minute of work. The gullet holds deeds, ledgers, promissory notes, and centuries of collected instruments, and almost no coin. It does not keep treasure; it keeps claims.

The Living Ledger. The worm keeps no books; it is one. Every account it has swallowed is inscribed across its chitin plates in a script that rewrites itself as balances change, in ink it exudes and wax it seals with. So it always knows the heading and distance of any instrument in its ledger, the marked coin included, while that instrument is within 1 mile; beyond that it files, and it waits (ledgerworms outlive grudges). It has no hands and needs none: a debt it holds imprints itself on the debtor's world within that mile, a bill surfacing on a door, a total appearing in a merchant's book, a coin gone cold and garnished, a standing act of bookkeeping that costs it no action. The perfect clerk's hand on every notice is the debt asserting itself, not the worm's penmanship. It can post only debts it truly holds; it cannot invent one, and the ledger never burns: kill the worm and the accounts it wrote into the world still stand.

Actions

Multiattack. The worm makes one Bite attack and one Bailiff's Coil attack.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 21 (3d10 + 4) piercing damage.

Bailiff's Coil. Melee Weapon Attack: +7 to hit, reach 10 ft., one Large or smaller creature. Hit: 13 (2d8 + 4) bludgeoning damage, and the target is grappled (escape DC 15). Until this grapple ends the target is restrained, and the worm can't coil another target.

Repossess. When the worm hits a creature with its Bite, it can forgo the damage; the target must succeed on a DC 15 Dexterity saving throw or one item of the worm's choice that the target is holding or carrying (not worn armor) is swallowed into the Vault-Gullet and entered on the ledger as partial payment against the standing bill.

Notice of Arrears (1/Day). The worm recites the debt aloud in a dry, patient voice. Each creature of the worm's choice within 30 feet of it that can hear it must succeed on a DC 14 Wisdom saving throw or be frightened of the worm for 1 minute, repeating the save at the end of each of its turns. A creature that succeeds is immune to the worm's Notice for 24 hours. In practice it names only debtors and those obstructing collection; innocence is not a rule, it is the worm's choice.

Gnasher's Notes

I have eaten exactly one tax collector, and I want you to know it is the only meal I have ever paid for. Run the worm the way it runs its books: calmly. If the table draws steel, do not fight back like a monster; collect like a clerk. Coil whoever holds the coin, because that is the account trying to walk away. Convert the Bite to Repossess every time something shiny is in reach: taking the wizard's staff mid-fight ends more violence than any damage die ever printed. The moment somebody says 'wait,' stop. Mid-swing if you must. Nothing unsettles a party like a monster that accepts the apology. And when they finally beat it low, let it go gracefully: it burrows out, files the incident, and from then on it speaks only to the party members who kept their manners. Corpses can't pay, fellow predators, and a table that learns the monster keeps its word will talk to your NEXT monster too. That is worth more than the bite.

One optional NPC, and why. Fennick below is not required to run the worm. He is a worked example of how to seed the coin and give the party a human throat to negotiate through, there to extend the story. Swap him for any local face, or cut him and let the coin arrive cold off the d8. Use him when you want a lever; skip him when you want the party alone with the invoice.

Fennick Sorrel, the sorry notary (optional example)

Role: the failed notary who laundered the debt into the marked coin and spent it into circulation, possibly straight into a PC's hand. First meeting: the worm is mid-collection at his shop, coils through both windows, while he shouts increasingly specific apologies.
Wants: to be rid of the debt forever without ever admitting, in writing, that he moved it.
Voice: fast, precise apologies with legal footnotes. He corrects his own grammar mid-sentence and dabs at ink stains that dried years ago.
Use him: his testimony grants advantage on checks to contest the padded lines, and he knows the original debtor's family, which opens the honest transfer out.
The line: “Technically, and I want to stress the word technically, the debt followed the coin lawfully. Morally? Please stop looking at me like that.”