Chaos is ready to invade the world. Are you up to the challenge? Caverns of Chaos is the first of a series of themed dungeon supplements. Using the core rules in Four Against Darkness and Four Against the Abyss, you may use this 26 page supplement to generate new missions, meet new monsters, and collect new treasure. The booklet includes six missions, new vermin, minion, boss, weird monsters, treasure and unique event tables, three new dungeon secrets, six new spells. This is not a stand-alone product. You need a copy of Four Against Darkness (and for some of the content, Four Against the Abyss) to use this book.