Corps of Discovery: Expansion 4 – FogExpansion

From BoardGameGeek:

Something about the fog that's rolled in plays tricks on your mind. While the fog is obscuring your vision, you can no longer rely on your pre-existing knowledge of the land to find the critical resources you need to survive. In this expansion each terrain rule has been changed, but you don't know how. Will you be able to navigate your way to safety or will you believe the lies that your eyes tell you while you're surrounded by this otherworldly haze? This Expansion also includes new Reference Boards and new Maps to play each of the previous chapters - but with Fog! So imagine trying to kill 3 Minotaurs in the Fauna Chapter - BUT - all the terrain rules are mixed up? This takes Corps of Discovery to a whole new level! -description from the publisher