From publisher blurb:
The magic woven into this legendary type of item is potent and carries the will of its originator. Each item awaits attunement, and once attuned, it gives you a taste of its power. As you use this item, it gradually observes your actions, awaiting the moment to make a judgment and determine whether or not you are a fit successor to the last will of the soul bonded within. Willforged Wonders are indestructible unless power equivalent to a wish spell is used to destroy it. Born when the soul of a creature with an indestructible will latches onto an important possession that had significant meaning to it, these items bestow those they judge worthy with great power. Through usage, you and the Willforged Wonder will form a deeper connection, and eventually it may bond with you in an magical covenant, where you awaken a new power within both you and your Willforged Wonder.