Clans & Portals is the first expansion for Rats of Wistar and it is a modular one, consisting of two distinct modules.
Clans adds asymmetry to the base game through 8 Mutation Tiles and 10 Starting Tiles drafted during setup.
Portals completely replaces the map with a new fantasy setting with a strong focus on exploration and introduces brand-new mechanics such as Magic Rings and Encounter Cards and Tokens.
—description from the publisher