From publisher blurb: Call to Arms is a book line for players and gamemasters alike. Each book focuses on a different type of item, expanding rules for those items and adding everything from new mundane and magical examples of the item to new character options related to the item. Call to Arms: Shields includes a look at the history and construction of shields, an alternative system for using shields, a large selection of new shields, special materials that can be applied to shields, how to use multiple materials with shields, and magic, cursed, mythic, and artifact shields both new and old.