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Brassreach: A Floating City of Gears, Secrets, and Steam
Paperback
Series: Game Master Campaign Settings, Book 9
Publisher: Independently Published
Published: Sep 19 2025
Pages: 128
Weight: 0.69
Height: 0.27 Width: 8.50 Depth: 11.00
Language: English
High above the surface of Stillwater Lake floats Brassreach, a city of invention, ambition, and control. Built by gnome technocrats and sustained by wonders of arcane engineering, Brassreach is a marvel of the modern age.
But even marvels have cracks.
Gears grind without cause. Clockwork servants glitch. Something grows beneath the city's shadow...
This 5E-compatible campaign setting gives you everything you need to explore a mysterious floating city, uncover political intrigue, face sentient constructs, and tinker with powerful inventions.
What's Inside?Brassreach is a complete campaign setting book, fully illustrated, filled with unique locations, adventures, factions, mechanics, and tools for both GMs and players.
- Five richly detailed city districts with maps, NPCs, and adventure hooks.
- A gnomish technocracy where politics is ruled by invention and merit.
- New player options, feats, backgrounds, inventions, and more.
- Constructs and glitches: allies, adversaries, and world-shaking malfunctions.
- 20+ adventure hooks and mini-arcs built into the city's fabric.
- Surrounding region including lake ruins, mold-choked undersides, and fertile lands farmed by machines.
- And much more
Brassreach brings new mechanical content for your table, including:
- Backgrounds like Clockwright's Apprentice and Escaped Test Subject.
- Feats like Emergency Override or Mechanical Symbiosis.
- Invention crafting rules with glitch risk-reward mechanics.
- Companion constructs you can upgrade or lose control of.
- Glitched magic items with unpredictable powers.
Brassreach isn't just a city of gears. It's a city of secrets.
- The Clockwork Assembly runs the city like a massive machine.
- The Fracture believes the machine must be destroyed.
- The Watchful are constructs on the verge of self-awareness.
- The Copper Coil sells illegal magic and forbidden tech.
Meanwhile, strange glitches strike more often. Power surges, clockwork quakes, lost memories, even sentient mold are common. Is it sabotage or something deeper?
Adventures AwaitWith dozens of hooks and short adventure arcs, you can drop Brassreach into your existing campaign or run an entire campaign within the city and its surrounding region. Some exciting plots include:
- The Mold Below - Explore the dangerous ecosystem under the city.
- Gears of Rebellion - Stop (or join) a construct uprising.
- The Broken Law - Defend an innocent when the city's justice machine breaks down.
All this and more are waiting inside.
So what are you waiting for? Get the Brassreach Campaign Setting today!
May all your adventures be grand!
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