The Frozen Halls — Hollow Adventures is a system-neutral, interactive, dark low-fantasy adventure supplement with an artistic and thematic old-school feel that you can adjust to any tabletop roleplaying game system. 
It contains one regional map (Voreia), a town map (Ersheath), and five dungeon maps (The Worm, Everflame, The Impossible, Under Ice, and Dark Blue), as well as characters and magic items. 
To construct your adventure, you use the mini icons index, tables, maps, NPCs, and items.