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The Horror Within, 8th-Level One Shot (5E)

Everyone who went to opening night of the Monveau Theater's newest show has gone completely insane. Can the characters uncover the shocking secrets inside the theater and find a way to end the plague of madness without losing their own minds? 

The Horror Within is a cosmic horror adventure for 8th-level characters. It's a one-shot that takes about 3-5 hours to complete and includes:

  • A maddening mystery where the characters' sanity is at risk

  • A thrilling battle against an Old One in the lost depths of the city

  • Combat cards for each monster, PC, and special treasure

  • High-quality digital maps for use with virtual table tops

Grab this adventure at a reduced price in the Bundle of Horror 2!

Note, this is a digital PDF product that we email to you.

Video walkthrough of the adventure below.

Customer Reviews

Based on 16 reviews
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Dan
Great as always!

I ran this last night for my group, tied it into my campaign as an introductory quest to a faction. It was fun and easy to run. The layout of your adventures is so easy to read through and play. I really enjoyed roleplaying the NPC's that were suffering from madness and when my PC's started to be affected they had a blast roleplaying that. Great fun was had all around!

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Faelyn Julian
Incredible!!!

The Arcane Library are incredible. This is a genius and honestly the best way to set up a DnD campaign. I have severe ADHD, but I was able to handle this so well. My players had so much fun, and were able to really get into the roleplay of the madness. I recommend The Arcane Library to everyone I can. Love you all!

C
Christy Custead
Fantasic!

Super easy lay out, well written and tons of fun! Definitely buying more like this one!

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Cooper Maddocks
A fun, spooky one shot!

I’ve never DMed anything before, always been a player, and in preparation for a larger campaign, wanted to dip my toes in with a one-shot. This campaign had the perfect blend of horror and mystery, along with some comedy my group always enjoys. The prep was easy, and everyone had a great time, the descriptions were the perfect jumping point for improv and custom descriptions, and helped me easily slide into the setting and roles needed, couldn’t recommend better!

R
Rachael Bryant
Great Story!

Amazing story, great immersion. Excellent opportunity for seasoned DMs to build into a game or new DMs to run a guided one shot. We loved it!
My family elected for a one shot a couple weeks ago cause a player for our ongoing game was out. I had nothing lined up and had turned to Google for some ideas and maybe some pre-written stuff when I found The Arcane Library, and the The Horror Within. This was maybe 90 minutes before the game started. It was a quick read to get the understand the settings, get an idea of the story and tone, feel out the theme, and get the maps loaded to Roll20. It was easy to execute, fun to embellish as we played, and my players lived the horror theme.