Joseph A. McCullough 
Frostgrave: Perilous Dark [PDF ebook] 

There are many tales of the Frozen City, and not all of them tell of battles between rival wizards. Often, the greatest adventures are those that pit a wizard and his trusty warband against the myriad perils found amidst the ruins of Felstad.This new supplement for Frostgrave presents rules for playing solo and cooperative games in which the focus shifts from the feuds of wizards to exploring the city, unlocking its mysteries and surviving what is discovered. With guidelines for scaling game difficulty, dungeon crawls, monster generation, and more, as well as ten scenarios demonstrating these options, this volume offers players everything they need to venture alone or with allies into Frostgrave. Why should wizards fight amongst themselves? There is plenty of treasure for all and the Frozen City is enemy enough!