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. While Call to Arms: Mantles of Power includes mantles that are merely made of cloth, the real focus of this book is to introduce new mechanics for mundane mantles of authority and mystical mantles of power, imbuing characters with in-game benefits.
Whether it would be taking on the title of “Town Guard” to becoming the “Hero of Light”, various boons, responsibilities, and abilities come with these titles. And of course there is the usual review and expansion of mundane, magical, cursed, mythic, and artifact mantles.