When your players are used to grand adventures spanning cities, nations, and perhaps even whole worlds or planes; how do you go even grander? The answer is you don't. Perhaps it is time indeed to go smaller. Much smaller!
Pond Scum is a regional guide detailing a singular pond which is only truly about 40 feet in radius. However, when your characters are suddenly shrunk to sizes invisible to the naked eye, only a few feet becomes a journey and threats once inconsequential become deadly.
Pond Scum is actually the description of a nameless pond which will be referred to in this book as the Pond of Protiston due to the identity of its primary inhabitant and threat. This book is meant to be setting neutral and easily placed in almost any out of the way location, but nominally it will be set in a region known as the Kaaya'yeeda in the continent of Anchôromé on the world of Toril. If the DM desires, its origin story can be easily altered, and its background location can be changed with little thought.
While the entire book encompasses what would typically be covered in a single turn of movement, when the player characters are measured in micrometers things get relatively much, much bigger.
- from the publisher's blurb