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On Her Majesty’s Pest Control ServiceClick to magnify
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On Her Majesty’s Pest Control Service

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On Her Majesty's Pest Control Service

This One Shot Adventure Module contains:

  • The story for a single adventure
  • Tips on how to run a introduction session for new TTRPG players
  • Builds for several new monsters
  • Build and Background for a NPC
  • Puzzles and riddles for your party to solve
  • Maps and ideas for special combat encounters

The Story

Like most large port towns with lots of food and bad sanitation, Ghenna has a pest problem. An unusually large rat colony has taken a liking to its scenic waterways and mouldy cellars. Each day, a thousand more furry creatures scuttle through the city’s drainage pipes and sewers. Usually, this isn’t a problem the local royalty would concern itself with. However, after Queen Marissa found rats dancing in her new summer home’s bathroom, the pest problem has been swiftly declared a threat to the crown. Unfortunately, knights and city guards make for bad exterminators and not many sane men are keen to delve through Ghenna’s wild sewers. To make matters worse, the superstitious citizens declared the weirdly smart rats to be the heralds of the demonic forces supposedly living under the city. Hence, the “Reformation through Extermination” act was passed, allowing local law enforcement to pass down fines measured in rat scalps. Captured criminals were allowed to shorten their incarceration by delving into the sewers and bringing back heads or pelts. Needless to say, criminal activity in Ghenna dropped considerably. Not because more criminals were deterred by the sentence, but because most of them never returned from the city’s rat-infested bowels.

In this 1 – 3-hour introductory adventure, a party of 1st level characters are sentenced to reformation through extermination. The task is not only disgusting and arduous, it soon turns deadly. Can they collect enough rat pelts before becoming rat food? Is there a way to stop the infestation altogether? Can they survive being “On Her Majesty’s Pest Control Service?

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Reviews (7)
Discussions (6)
Customer avatar
Max P October 18, 2022 11:30 am UTC
Given that you can reduce your criminal sentence with the "Reformation through Extermination Act" they could be called the Sewercide squad
Customer avatar
Elena W August 10, 2020 7:58 pm UTC
Really liked the story, pretty much perfect for introducing two new players to DnD. Would have liked just a little more advice on how to roleplay Locke and Glenn though:)
Customer avatar
Anthony H December 13, 2019 9:22 pm UTC
Great for beginners. Very didactic.
Customer avatar
Justin Z November 05, 2019 5:42 pm UTC
My party and I are using this as a one off while we wait for our fourth. We're all excited af.
Customer avatar
Thomas K October 24, 2019 2:33 am UTC
First time DM and chose this story. Worked out great. Added a few surprises but kept to the story overall. Had to add a few "helpers" at the end as the final boss was not strong enough to give the group of 4 a run for their money. They enjoyed the story and the puzzles.
Customer avatar
martin S September 30, 2019 1:54 pm UTC
Great for beginners - played it in a group of four, where three were beginners.
Map size and game length can be adjusted - had to shorten it at the end, as the group spent too much time on "side quest" and didn't go to the actual catacombs to find the rats.
Great fun would recommend!
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File Last Updated:
October 22, 2019
This title was added to our catalog on September 16, 2019.