From publisher blurb: Are you a busy GM? Does session prep take too long? Do you never have time to work on the cool little details that can bring your session to life? Well fear not! That’s where the 20 Things line comes in. Compiled from the free 20 Things posts available at Raging Swan’s website, this short, focused compilation gives you, the time-crunched GM, the tools to effortlessly add verisimilitude and detail to your adventure. Use the material herein either before or during play and bask in your players' adulation. This instalment is designed to help you to flesh out and bring to life the besieged castles in your campaign.