Welcome to an adventure of wires and gravity wells, stellar engines, and artificial minds that whisper promises through patterned static. The old powers were buried beneath dust and data centuries ago, leaving both chaos and opportunity for those willing to adapt. The universe expands, awaiting for those to search the dark depths of space for treasure and tragedy.
MechD20 is what you choose to make ot if. You can use these rules to make a future of shining utopias, or the cold, indifferent sprawl of abandoned colonies. You can adapt these rules to create mercenaries in the stars, or androids driven to combat by corrupted code, or civilizations that vanished without explanation. Yo can convert Sorcery into circuitry, divinity into deep theory, and the void—ever hungry—still calls forth those brave enough to explore it. The unknown has not become any less strange. Only now, civilization believes it can be conquered.
How to use MechD20 in your D&D Campaign
This Setting is a Genre Shift from Fantasy to Science-Fiction
This supplement reimagines Dungeons & Dragons not as a world of castles and dragons, but as a galaxy of decaying space stations, rogue black holes, forgotten AIs, and ancient technologies mistaken for gods. It maintains the structure of D&D while placing it in a universe where spellbooks are replaced with neural matrices, and radiant light comes not from angels—but from reactor cores. The laws of reality haven’t changed—only our understanding of them has.
A Re-Theming, Not a Rewrite
You won’t need to learn a new system to play in this world. MechD20 is a conversion tool—a reframing of the existing D&D 2024 rules. Character creation, levels, spells (now Powers), and combat mechanics are all intact. This book gives you the narrative and cosmetic tools to shift your campaign into a futuristic tone while keeping the game’s mechanics compatible with every published 5e supplement.
Newly Developed Magic, Mechanics, and Lore
Each class has been reinterpreted to fit a world without gods or wizards. The Paladin becomes the Mystic, a warrior bound to a cosmic pact protocol. The Cleric is now the Theorist, wielding power not through faith, but through understanding. Magic, too, is split into two forces: Cosmic Power, raw energy drawn from space-time itself; and Tech Sorcery, the manipulation of code, machines, and synthetic biology. The same rules apply—but the world they describe is different.
A Compatible Expansion for Any Sci-Fi D&D Campaign
Whether you’re playing in a setting of your own design or reskinning an existing campaign into a space opera, this book is modular. Use it to enhance Spelljammer into a darker tone, convert a Planescape campaign into a multiversal starcruiser epic, or reframe your fantasy world as a post-cataclysmic orbital remnant. This book does not provide one unified setting—it gives you the tools to build your own.
A Gateway for Homebrew and Digital Integration
Everything in this book has been designed with D&D Beyond homebrew integration in mind. Equipment, weapons, abilities, and class features can all be entered into the homebrew system. Use this supplement to build a digital character sheet that reflects a futuristic narrative while keeping full mechanical compatibility with D&D’s digital infrastructure.