Design Diary:
Sporefall

Back when I was in high school a supplement came out for AD&D (D&D 2nd edition)’s Ravenloft setting titled Castles Forlorn. It was a sandbox adventure set in the land of Forlorn, and featured a castle, Castle Tristenoira, that was stuck between three time periods. It was a challenging adventure to play, and even more challenging to run as a DM.

The Inspiration

Why Try to Be Different

However, it was perhaps the most unique adventure TSR had put out to that point… and since then, I’ve tried to push myself when writing adventures to try and avoid too many tropes and to try to surprise my players with something truly unique.

The Challenge

Dungeon Jam 2026

Dungeon Jam 2026 launched at the end of last month (May 2026), and “Dungeon Tubers” churned out adventures to give away to their viewers for the event. My twin brother Vase and I wanted to take on the challenge of creating an adventure for Dungeon Jam, and we felt that the restrictions of a 5-room dungeon provided the right setting to create something truly different.

The Twist

A Dungeon That Isn’t a Dungeon

So, I decided that I would make a “5-room dungeon” that wasn’t a dungeon at all. At first I was going to make a dark bog that shifted constantly, with a horrid bog hag as the final boss. But then I looked back at one of the dragons for our Dragons! Dragons! Dragons! crowdfunding campaign, the Spore Serpent, and thought, why not create a setting in which this fungus-themed dragon takes over a town, and possibly an entire continent?

This was a perfect opportunity to please our backers with an early preview of one of the dragons, as well as one of the dynamic lairs from the companion book, Dragons!… And the Places You Shouldn’t Visit, while at the same time giving something back to our YouTube and newsletter subscribers!

The town is the dungeon, and as the spores and fungus take over, the map changes, allowing for players to find new things in places they have visited just hours before. Thus, there are three different maps of the same town, as each dawn brings more terror to your players’ doorstep.

The Breakdown

The Five Rooms of a Town That Eats Itself

Here are the key elements of the “5-room dungeon” that is not a dungeon:

Room One — Entryway

The entryway for this “dungeon” is literally the adventuring party, the heroes, entering the town of Caporra and witnessing a massive flock of black birds fly overhead. The birds start dying mid-flight, and fall at the PCs’ feet and throughout the town. The stage is set for a fungal takeover, but nobody knows it yet.

Room Two — Puzzle

Later that day, the townsfolk begin to act strangely. Some have unexplainable rashes, some get violent… The poor gather inside the church, and by chance, the PCs may be able to figure out what is causing the problems and possibly cure it.

Room Three — Setback

The next day, it appears everything is solved… but very quickly the infection returns, and the antidote is depleted! Fungus, mycelium, rot… quickly take over buildings, people, and even wild animals, which begin to raid the town.

Room Four — Climax

Soon, chaos erupts. A massive spore cloud creeps into the town, choking everything. People are now turning into fungus-zombies, animals are also going crazy, and riots flood the streets. The heroes have to struggle through violent streets, crowded with hostile people who are throwing rocks, knives, and more. It seems hopeless — and then…

Room Five — Revelation and Twist

It is now that a gargantuan shadow clouds the horizon, as the Spore Serpent enters the town. The final battle tasks your players with new hazards and mechanics that will challenge their tactical prowess, and force them to make decisions they would otherwise not make.

The Payoff

Will They Survive the Three Dawns?

I had a lot of fun writing the adventure, and Vase racked his brain coming up with the abilities and attacks of the creatures. This is an adventure that I guarantee your players will not soon forget!

Can your players survive the three dawns?

Free Download  •  D&D 5e Adventure
Sporefall

Head on over to download your copy for free.

Download Sporefall ›

Until next time,

— Gio
Keep the Conversation Going

Watch on YouTube