From publisher blurb:
Experimenting with dragons is dangerous, especially so with their remains, as even the most precautious processes have a high chance of failure. Yet some Rogues are more than willing to take on the risks of draconic fusion, becoming a more positive defect of the process: a Drakenheart. These wyrmbound Rogues show the mutation of their bond through minor transformations, forming a dragon’s claw over their own limbs and empowering it with lesser draconic boons. Such infusions often lead a Drakenheart to desire more, for the power of dragons is much too enticing for mortals.
Following this new Roguish Archetype are several supportive optional rules, an expansion of the Dragon Knight’s Draconic Synergy system, and five new magic items that rely on even the most minor form of Draconic Pacts.