Mattias Johnsson Haake, Mattias Lilja

Mattias Johnsson Haake and Mattias Lilja are Swedish game designers who co-created the tabletop role-playing game Symbaroum. They developed this fantasy RPG setting through their company Järnringen, which they founded to publish their gaming works. The duo draws inspiration from Scandinavian folklore and dark fantasy themes in their collaborative projects. Their primary work focuses on the Symbaroum universe, a setting that blends environmental themes with traditional fantasy elements. The game world features a corrupting force called the Dark that spreads through magic use, creating moral dilemmas for players. Their design philosophy emphasizes narrative-driven gameplay over complex mechanical systems. The authors have expanded the Symbaroum line through multiple supplements and adventures since the core rulebook's initial release. Their work has been translated from Swedish into English and other languages, reaching an international audience of tabletop gaming enthusiasts. They continue to develop content for the Symbaroum setting through ongoing publications and digital releases.

Players praise the Symbaroum Core Rulebook for its atmospheric world-building and unique approach to magic corruption. Many reviewers highlight the game's environmental themes and how the Dark creates meaningful consequences for character actions. The artwork receives consistent positive feedback, with readers noting the evocative illustrations that capture the setting's mood. The streamlined mechanics earn approval from players who prefer narrative focus over complex rules. Reviewers appreciate the simple d20 system and how character abilities feel distinct without being overpowered. The bestiary and monster designs receive particular praise for originality and connection to Scandinavian folklore. Some readers criticize the book's organization and layout, finding certain rules scattered or unclear. A few reviewers mention that the corruption mechanics, while thematic, can feel punitive during actual play. Others note that the setting's dark tone may not suit all gaming groups, particularly those seeking lighter fantasy adventures.