Below the earth lurks things best left un-disturbed..unless you are hoping for a fat sack of loot, then you should definitely go poke around! With this expansion your campaign map will feature caves to explore in addition to the normal Threat system. These give you side objectives you can explore at your own leisure, with a new enemy table to content with. Additionally, you may face pits used by the enemy as hide-outs, spreading evil and decay around the world. Leave a pit alone and you may face attacks, increases in Threat or even see the wheel turn. This expansion is designed for 2nd edition Five Leagues From the Borderlands. —description from the publisher