Mattias Lilja

Game designer, writer & partner at Free League Publishing. Mattias, or “Matti” to friends, got into role-playing games in the early 80-ies and never got out. He co-founded classic Swedish game studio Järnringen that merged with Free League Publishing in 2018. Mattias´career has taken him many places, from a B.S. in Science and working as a physiotherapist, to Paradox Interactive as a producer and later as COO. He designed the first edition of Coriolis (from which Free League Publishing took its name), and co-designed the dark fantasy TTRPG Symbaroum.

Mattias lives with his family in Värmdö outside Stockholm.


Published books

Symbaroum Starter Set - Treasure Hunts in Davokar



The Chronicle of the Throne of Thorns



  • Thistle Hold – Wrath of the Warden (2016)
  • Karvosti – The Witch hammer (2017)
  • Yndaros – The Darkest Star (2018)
  • Alberetor – The Haunted Waste (wip, 2021)


Symbaroum Core Books


Rules Designer and Co-Writer

  • Symbaroum Core Rulebook (2016)
  • Advanced Player’s Guide (2017)
  • Symbaroum – Monster Codex (2018)
  • Game Master’s Guide (2020)


Coriolis - The Third Horizon


Original Concept

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