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Deep dungeon that goes to the underdark. The party is locating and escorting a supplier who has yet to return back with supplies to make important enchanted oil and wicks for lanterns that are designed to keep beasts off the streets at night. Without this supplier and supplies, less light for the town spells certain disaster for its citizens. · Medium · Medium

The Mold Kiln

The lantern oil ran black, and the dark grew something to feed on.
Rooms
9
Foes
20, CR 1/4 to 5
Traps
8
Treasure
783 gp
123456789Entrance
Select a room on the plan to open it.

The party is in

1. Service Descent

Seen

Something wanders by

At a glance

The threat

A rogue fungal intelligence now dominates the vaults below the nursery floor, using spores and alchemical runoff to spread its body through the complex.

Wandering monsters (1d4)

  1. 1

    2d4× Mold GnawerCR 1/2

    When: When torches are lit in damp corridors or food is carried openly.Small blind tunnel scavengers drawn to spilled oil and movement.
  2. 2

    1d3× Spore-Touched LaborerCR 1

    When: After loud combat or if fungus is burned in one of the nursery rooms.Spores drift into discarded bodies, making them wander the halls in search of warmth.
  3. 3

    1d2× Ceiling MiteCR 2

    When: In narrow passages, especially near or the flooded tunnel.Thin fungal predators that stalk from cracks and overhead ledges.
  4. 4

    Mire SalvagerCR 3

    When: When the party lingers near vaults, caches, or abandoned storage.A masked scavenger armed with a hooked cutter and a sack of questionable salvage.

Rooms

9
1

Service Descent

2 foestreasuresecret

What they see

Read aloud

A slanted service stair drops into a damp entry chamber where old lantern hooks hang from the ceiling like teeth. Faint bioluminescent moss marks the safe path, while a broken supply sled and fresh drag marks point toward the inner vaults.

Features

  • Cracked lantern hooks
  • Moss-lit floor arrows
  • Broken supply sled
  • Shallow puddles with oil sheen

What the GM knows

Monsters

2× Mold-Gnawer RatswarmCR 1/4

Scavengers with fungal scarves and sap-stained knives who search for usable scraps.Tactics. They dart underfoot, trying to trip intruders and retreat if badly wounded.

Treasure

Lantern Cap8 gp

A waterproof lantern cap that can hold a steady flame in heavy damp.

Maintenance Kit12 gp

A small pouch of salt and wick wax enough for a few repairs.
Room secrets · GM only

Notes

This is the entrance and should feel like the party is already inside a failing worksite. Let the drag marks and fresh spores point deeper toward and the flooded side route.

4 doors: W (normal), E (archway), N (archway), S (normal)

The place

What it is

This forgotten refinery once prepared enchanted lamp oil and treated wicks for the town's night lanterns, but the workrooms have been overtaken by fungus and repurposed into a living nursery.

Atmosphere

Wet stone sweats under a blanket of spores.

The threat

A rogue fungal intelligence now dominates the vaults below the nursery floor, using spores and alchemical runoff to spread its body through the complex.

History

The Mold Kiln was built by civic alchemists and lanternwrights decades ago as a deep service complex beneath the city's lamp stores.

Rumors

1d5
Roll a rumor

  1. 1The old lamp supplier was seen carrying a crate into the service stair, then vanished before dawn.
  2. 2Miners swear there is a room below the vaults where mushrooms glow like lanterns and whisper when cut.
  3. 3Some say the town's failing lantern oil was stolen by smugglers, not monsters.
  4. 4A watchman claims he heard a voice calling for help from inside a sealed wall near the flooded hall.
  5. 5Priests warn that anything preserved underground for too long becomes hungry for light.

Plot hooks

4
rescueFind the Missing SupplierThe town's night lanterns are failing, and the supplier carrying the next batch of oil and treated wicks never returned.From: Marwen Tallow, master lamplighterReward: 200 gp and lifetime access to town supplies
cleanupStop the Spores at the SourceStrange spores have begun appearing in lantern soot across the city, suggesting the supplies were tampered with below ground.From: Sister Vale, temple healerReward: A blessing against disease and poison
recoveryReclaim the RefineryA rival merchant offers a bonus if proof is brought back that the old refinery can be safely reopened.From: Jorren Pike, supply brokerReward: 150 gp plus a discount on gear
investigationTrace the BeastlightThe city watch wants the source of the nighttime beast stirrings traced to the deep complex before panic spreads.From: Captain Orla RennReward: Official favor and a writ of passage

Corridors

3

  • Between the flooded hall tunnel and

    Thin mats of glowing fungus line the walls and flare when disturbed, briefly revealing bootprints and drag marks.

  • The loop corridor near and

    Rusted service pipes leak warm condensate that smells of lye and spoiled grain.

  • Shortcut passage between and

    Collapsed storage shelves create crawlspaces packed with shattered lantern glass and black powder stains.

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