From publisher blurb: Ultimate Herbalism first introduced the microcosm system, a series of secondary biomes that modifies the flow of the herbalism non-Vancian subsystem, below. This free expansion details the new pollution microcosm, which encompasses the ideas of toxicity and the reclamation of ruined land. The Process 1: Each morning, pick random herbs from a selection based on your current biome. 2: Each evening, store leftover herbs overnight day in preservation vessels. 3: When you have enough, plant your favorite herbs in cultivation pots so you always have them. 4: Learn and collect the ingredients for recipes, which give you huge, awesome effects that reward you for being a compulsive gatherer.