Americans are on track to spend about $13.5 billion on Halloween this year. That works out to roughly $115 per person, according to the National Retail Federation’s 2026 survey.

You don’t need $115. You need one table, on one night, to feel wrong in the best possible way.

But search for prop advice and you get handed two options. Option one is the haul video, where a cheerful person shows you a $90 pile of resin skulls. Option two is the build guide, where you’re told to carve insulation foam. Session 0 Studios recommends papier-mâché for a wall-mounted dragon head, and honestly, respect, but also: no. I work a job. My weekend is already booked by prep.

Here’s the third option nobody writes about. Twenty dollars, total, for a kit that fits in a shoebox and comes back out every October for a decade.

Stay with me here. There’s a spreadsheet involved, and I apologize in advance.

It’s October. You just bought the scary book.

You know the one. Cover art with fake grease stains on it. Forty pages of derelict hallways and wrong-shaped teeth. You read the whole thing in one sitting on your phone in bed, which was a mistake, and now you want to run it at your table on the 31st.

Then you hit the back page and your stomach drops. Wrong stat blocks. Wrong saves. There’s a whole subsystem in there called Stress, and your group plays D&D 5e, where “stress” is what the DM feels when somebody asks about crafting rules.

So you search for a conversion guide. And every single one tells you the same thing. Swap the monsters. Eyeball the DCs. Keep the story, dump the math. Cool. Thanks.

Not one of them mentions the horror rules, which, guess what, are the only reason you bought the book.

Let’s fix that. This post covers why the usual advice fails on horror modules, a three-question diagnostic I call the Load-Bearing Test, and a five-step method for porting a scary module into whatever system your table actually plays.