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An OSR Mega-Dungeon of Mutation and Madness

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Forty-seven years ago, the alchemical fires meant to cleanse Lucerna instead transformed it into something else entirely. Now called Plaguehaven, this sprawling maze of twisted streets and shattered spires serves as both mega-dungeon and mutation engine — a place where reality bends like heated glass and even the rats conduct experiments in forgotten laboratories.

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This mega-dungeon project is currently in development, designed for sophisticated sandbox play where factional politics between mutant rat clans mesh with traditional dungeon exploration. When complete, players will navigate five distinct districts spanning levels 1-15, each controlled by unique Scourgefur clans with their own agendas and mutations. The focus lies on player ingenuity, resource management, and meaningful choices about corruption and power.

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Being developed for compatibility with Old-School Essentials and similar OSR systems. Follow along as this project takes shape!

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Your journey through Plaguehaven begins here. Subscribe for early access to resources, join a growing community of creators, and stay connected to the project’s evolution.

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Build Along With Me

Follow Plaguehaven's development from foundation to completion. Get early access to tools, participate in design discussions, and shape the evolution of this unique mega-dungeon.

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Master Mega-Dungeon Design

Learn structured approaches to large-scale dungeon creation. Each release includes detailed explanations of design principles, GM tools, and practical worksheets.

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Join the Community

Connect with other ambitious GMs. Share ideas, get feedback, and collaborate on dungeon design challenges in our growing community.

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