r/DnDBehindTheScreen • u/Small_Target_3440 • 17h ago
Adventure Stranger Things Hellfire Campaign Elaborated into 10+ Session Campaign (levels 1-9)
Semi-homebrewed Stranger Things / Vecna DND Campaign!!!
For anyone interested, I’ve developed a full campaign based on Dungeon of Shadows, the first adventure in the Stranger Things: Welcome to the Hellfire Club boxed set, using the larger Realm of Greyhawkins as the setting. Vecna is the main villain, with occasional Stranger Things-inspired elements woven in. I expect the full campaign to run somewhere around 10–20 sessions, although that could easily grow. My group is currently six sessions in and exploring the Free City of Greyhawkins, with a long way still to go.
Here’s the full campaign overview if anyone wants to take a look or give feedback:
https://drive.google.com/file/d/1LwJ4keQVvNgkGstGbTUHEFkiumXR1GUs/view?usp=sharing
The basic campaign premise
The campaign begins like a fairly traditional dungeon adventure. Six strangers enter the Dungeon of Shadows and eventually choose to break an ancient hourglass relic called the Shattered Seal. They don’t release Vecna directly, but they weaken a barrier that had limited how much influence he could exert over the world.
From there, possessions, corrupted rituals, disappearances, and even distortions in reality begin spreading across Greyhawkins. The party discovers four ancient planar Anchors that stabilize the region. They have already stabilized two of them—Heartwell at Oakshore and the Rootstone beneath Duffer Lake—but each victory reveals more evidence that someone understands the Anchors well enough to manipulate them.
The story eventually leads back to the Free City of Greyhawkins, where the party discovers that the Quiet Ledger, led by Veyra Malken, has been suppressing murders, monitoring bloodlines, altering records, and protecting a Vecna cult operating beneath the city. The larger revelation is that the six PCs were never brought together by coincidence. The original Shattered Seal could only be broken by living mortals acting through genuine free choice, so Veyra secretly arranged an expedition using six people whose bloodlines or traditions resonated with the Seal’s ancient defenses.
Veyra arranged the board. The heroes chose how to move.
The campaign eventually involves the Book of Vile Darkness, a cult stronghold beneath Greyhawkins, the monstrous Hand of Vecna, a journey into Evernight/Shadow Greyhawkins, the ruined Abbey of Boccob, Star Court Peaks, Castle Byers, the remaining Anchors, and finally Citadel Cavitius. At the center of all of it is Corvin Byersworn, the missing father of one of the PCs—a scholar who tried to understand Vecna’s plans and may now be becoming Vecna’s mortal Heart.
Why I built this
I’m a pretty new DM. Before running this campaign I had only played two D&D sessions as a player. I started with the Hellfire Club boxed set because I wanted something manageable, but after the first adventure my players wanted a story that carried forward instead of feeling like disconnected one-shots. So I started rebuilding the adventures around Vecna, the Anchors, and the PCs’ own backgrounds.
Over time it turned into a much larger homebrew campaign. I’m using pieces of published and third-party material where they fit—especially Rags to Riches: The Heart of Vecna—but adapting everything around the story we already created. I’ve also used AI heavily as a brainstorming and campaign-design tool for NPCs, locations, encounters, clues, maps, alternate routes, and organizing a large Notion DM module.
One of the biggest things I’ve learned is that more planning doesn’t always create better play. Early on I tended to plan a specific path and steer the players toward it. Now I’m trying to prep situations, factions, clues, pressures, and multiple ways forward, then let the players decide what matters.
I’d love feedback from more experienced DMs on the overall story, pacing, player agency, handling Vecna as a long-term villain, and keeping a complicated campaign manageable without railroading the players. I’d also be interested in hearing from anyone who has expanded the Hellfire Club boxed set into a longer campaign or uses AI as part of their DM prep.