Res Arcana
Can you play Lux et Tenebrae or Perlae Imperii with Res Arcana Duo alone?
The designer answered this directly in a BGG reply.
- Tom Lehmann · Designer · 2025-06-24
Not officially. Both expansions assume base-game components and rules that Duo does not provide. Duo itself can be combined with the base game and both expansions.