The Age of Flesh is Over,
The Reign of Steel Begins.

Forget simple monster hunting. In the cursed city of Luyarnha, the true horror isn't the beasts on the streets; it's the political machinations that weaponize them. This is HERESY OF STEEL, a D&D adventure where terror is systematic, and your survival depends not on steel alone, but on navigating a web of deadly alliances.

Three factions—the Radiant Church, the Scions, and the Forsaken—are tearing the city apart, each accusing the others of causing its downfall. But it is the Angel of Flesh who is truly behind this chaos, manipulating them from the shadows as he perfects his experiments. Soon he will have a mechanical army powerful enough to wipe out all biological life. Your task is to expose his plan and end it before it’s too late. Uncovering the Eldritch Truth behind his work may be the only way to stop him.

^{The Angel of Flesh is a manikin, a mechanical being, draped in the skin of those he kills.}

Inspired by Gothic and Lovecraftian horror, Heresy of Steel is a level 1-6 campaign for 5e and 5e 2024. It can be played on its own or integrated with Steinhardt’s Guide to the Eldritch Hunt.

Key Features

Moral Choices

Every decision matters. The Faction Standing system tracks your party’s reputation with each faction.
Your alliances and betrayals determine the fate of the city.

Will you install a holy regime, allow chaos to spread, forge a new fate for Luyarnha—or will you burn it all to the ground?

Horror Mechanics

Unleash a full Madness System with over 300 effects that capture the mental and physical toll of fighting the Scourge.
Optional Rest Rules intensify the grimdark tone of the campaign, adding lasting consequences to every battle.

Personal Stories

Choose one of 10 Personal Missions to tie your character to the story. Hunt the beast that killed you, find a cure for the Scourge, or expose the city's darkest secrets. Experience personal storylines rarely seen in official adventures.

Combat & Encounters

Inspired by Bloodborne, Heresy of Steel features tactical, environmental fights that reward strategy over brute force.

Every battle, whether in collapsing cathedrals or infected laboratories, features custom maps. Every enemy, whether gothic beast or eldritch horror, features custom art.

Tokens

^{Some of the new art present in the module}

Downtime Activities

Between hunts, players can pursue faction missions, unlocking unique rewards which evolve as alliances deepen, turning politics into power.

Among these are Trick Weapons—transforming mid-battle at the pull of a trigger (or a click in Foundry).

By DMs, for DMs

Built to make life easier for new GMs, and faster for veterans.

Every element of Heresy of Steel is optimized to streamline your prep and keep the focus where it belongs: on storytelling and tension. Whether you’re launching your first campaign or running your hundredth, this adventure is designed to save you time without sacrificing depth.

Created by the team behind the Foundry Module for Steinhardt’s Guide to the Eldritch Hunt.

Reviews for Steinhardt's on Foundry

^{Some of the reviews for the Foundry VTT module of Steinhardt's}

Heresy of Steel is an adventure for GMs and players who want a truly challenging horror experience, one where every victory carries political weight.

The Age of Flesh is Over, The Reign of Steel Begins.

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