Become an Agent of Syn, replace your heart with a Crystal, and gain superpowers! (also lose your mind, but just a little). In the world of Crystal Heart, people's hearts are literally made of stone. Agents of the mysterious organization Syn scour the world in search of Crystals, powerful relics of a bygone age. Syn Agents replace their hearts with these Crystals, which grant incredible powers...but also affect the bearer’s personality in unpredictable ways. Inspired by the styles and sensibilities of anime and superhero media, the Crystal Heart setting was developed in the webcomic Up to Four Players as the characters were playing it. Now you too can become a Syn Agent, explore ancient ruins and hunt down powerful Crystals!