The dungeon is where legends are made — and Campaign Builder: Dungeons & Ruins gives you everything you need to build ones worth remembering. This is the ultimate dungeoneering toolkit for D&D 5th Edition, covering dungeon design from first principles all the way up to full megadungeon construction. Whether you're dropping a single trap-filled vault into an existing campaign or building a sprawling subterranean complex that will anchor an entire arc, this book has the tools, tables, and player options to make it sing. Compatible with both D&D 5E and Tales of the Valiant. Who This Appeals To Game Masters who want to build dungeons that feel designed rather than random — with logical room layouts, meaningful traps, and encounters that escalate naturally. Also great for GMs who want to give their dungeon-delving players new mechanical options to work with. Features 15 sample curses, 17 hazards, and 12 all-new traps — plus a step-by-step guide to designing your own 6 new subclasses, 5 new heritages, 11 new talents for dungeon-focused characters 40+ new magic items and 15+ new spells for dungeon delvers Advanced exploration and skill challenge rules to push characters to their limits Dungeon design principles: clever tricks, wandering monsters, logical room mapping Megadungeon construction rules for major campaigns Downloadable Dungeon Tracker sheet to keep your creation organized What You'll Experience The megadungeon rules are the standout feature for long-term campaign GMs — they give you a framework for building a living dungeon that evolves as players explore it, with factions, restocking tables, and escalating threats. The trap design system is equally strong, letting you build traps that feel like puzzles rather than random damage. Related Products Campaign Builder: Cities & Towns — The companion volume for urban worldbuilding Campaign Builder: Dungeons & Ruins Map Folio — Ready-to-use dungeon maps Ultimate Treasury (5e) — 1,000+ magic items and treasures to stock your dungeons Mythos Monsters for D&D 5th Edition — 40+ eldritch creatures for dungeon encounters Tome of Heroes (5e) — Expanded player options for dungeon-delving characters
