Online courses for tabletop RPGs
Become a better
Dungeon Master.
RedTrolls teaches you what it takes to run an exciting game for your friends with confidence: writing adventures, running the table, and creating villains worth remembering. For D&D, Pathfinder, Call of Cthulhu or whichever system you play.
Title art by Deiv Calviz, used with permission
Our courses
Three courses
Lifetime access, all future updates, one payment. Every course has a 30-day money-back guarantee.
59 lessons
Great Game Mastering
Take a seat behind the DM screen. Preparing, running and rescuing a game, from your first session to the trickiest table.
$39 View course →
29 lessons
Writing Adventures
Never run out of adventure ideas again. Ten story methods, plot tools and NPCs that feel alive.
$39 View course →
41 lessons
Villains & Paragons
Deadly adversaries and glorious champions: traits, lairs, minions, voices, and 32 ready-made villains.
$39 View course →
Bundle offer
The whole thing!
Writing Adventures and Great Game Mastering together for $65 instead of $78.
Free course
Make your own random generators.
Because sometimes you need to wing it. A free mini-course on building your own generators for monsters, NPCs, names and stat blocks. No AI involved, and they work offline at your gaming table.
After you sign up: a free adventure two days later, then one email a week, a DM tip or another free adventure. Unsubscribe with one click.
Meet your instructor
Hey, I’m Mark.
I am a scientist who also happens to be a long-time roleplayer with 30 years of experience. I have DMed many different systems, from fantasy to sci-fi, and thanks to my day job of handling bacteria in a lab you’ll likely get a unique perspective :)
I spent years putting the information in these courses together and learned a lot along the way, which I would love to share with you.
We share the most amazing hobby on the planet, you and I, and I am passionate about getting the most out of our gaming and preparation time to bring the fun front and center. Pull up a chair, roll for initiative, and let’s get started.
RedTrolls © 2026
“Dungeons & Dragons” and “Dungeon Master” are trademarks of Wizards of the Coast LLC. No infringement is intended.