Alone above. Alone below.
Solus Domini is an integrated and complete solo hex-crawl and dungeon crawl role-playing system that lets you explore a living fantasy world on your own — no Dungeon Master required. Inspired by the classic hex-crawls and dungeon expeditions of early D&D but fully compatible with 5e and other modern editions, Solus Domini turns exploration and discovery into a rich, procedural game you can play anytime, anywhere.
Solus Domini is also available at DriveThruRPG.
What Is Solus Domini?
At its heart, Solus Domini is about adventure through exploration.
You control a party of characters, travel across wilderness hexes, and delve into ruins, caves, and dungeons that unfold through dice rolls and your imagination.
The system is divided into two parts:
- Solus Supra — The wilderness crawl. Each day brings new choices: travel, rest, forage, or explore. Weather, terrain, and encounters shape your journey, one hex at a time.
- Solus Infra — The dungeon crawl. When you discover a ruin or cave, Solus Infra takes over, guiding you through chambers, corridors, hazards, and treasure — procedurally generated and endlessly replayable.
Together, they form a complete campaign engine: travel → discovery → delve → return.
Why Play It?
Even if you already play D&D or other tabletop RPGs, Solus Domini offers something special:
Play When You Want
No scheduling, no group logistics. You can play Solus Domini solo at your own pace — a few minutes a day or an entire weekend session.
Perfect for DMs
Dungeon Masters can use Solus Domini as a world-building tool. Generate maps, encounters, and dungeons on the fly, or use its systems to prep your next campaign with fresh ideas and unexpected twists.
Classic Feel, Modern Flexibility
Built around the old-school principles of discovery and risk, Solus Domini works with any fantasy ruleset — from early TSR-era D&D to modern 5E. It’s system-neutral by design.
Emergent Storytelling
Every roll tells a story. You’ll keep a travel log, sketch maps, and watch a unique adventure unfold that no one else will ever play the same way.
Authentic OSR Aesthetic
Filled with black-and-white line art and classic hex-crawl sensibility, Solus Domini looks and feels like a lost rulebook from the early days of D&D — lovingly updated for the modern solo player.
Key Features
- Fully self-contained solo RPG system — no GM required
- Compatible with classic and modern D&D rules
- Distinct wilderness (Solus Supra) and dungeon (Solus Infra) systems
- Procedural encounters, hazards, and treasures
- Tools for world-building, journaling, and campaign prep
- Example play logs and clear, step-by-step daily procedures
- Evocative black-and-white line art and classic layout
- Infinite replayability — every campaign is unique
Begin Your Journey
Ready to explore the world alone above and alone below?
Buy Solus Domini at Ruckerworks.com
Solus Domini is also available at DriveThruRPG.
Frequently Asked Questions about Solus Domini
Q: Does Solus Domini work with modern D&D?
A: Yes. It’s system-neutral and plays great with classic and modern D&D.
Q: Do I need a DM?
A: No. The procedures handle exploration, encounters, and dungeons.
Q: Can DMs use it for prep?
A: Absolutely. It’s excellent for world-building and on-the-fly dungeons.
Q: Can I play Solus Domini using characters from my D&D campaign?
A: Yes. You can use your existing D&D characters or create new ones specifically for solo play. Solus Domini provides the structure for exploration and encounters, while your preferred ruleset handles combat, spells, and equipment.
Q: How long does a typical game session take?
A: A session can be as short as 30 minutes or stretch into several hours. You can play a single day of wilderness travel or an entire expedition underground. The system is designed for flexible pacing — perfect for quick sessions or long solo adventures.
Q: Is Solus Domini beginner-friendly?
A: Very much so. The rules are written for players and DMs of all experience levels. If you’ve ever wanted to learn how hex-crawls or dungeon generation work behind the screen, Solus Domini walks you through the process step by step.
