In the RPG
This multifaceted, blood-red ruby seems to shine with an inner glow. Anyone grasping it firmly feels a kind of suffusing warmth, as if everything will be all right with the world. In darkness, the glow produces a reddish light that illuminates a five foot area around the gem, but only so long as it is held by a living creature. According to stories, the first of these jewels was created using the heart of a powerful gryphon that once served a dwarf-king, but this is likely just a rumor.
So long as the owner keeps the heart in his possession, he earns an enhancement to his agility. In addition, once per day, the gem can be held in open hand and commanded to fly. The jewel takes its owner along for the ride, but he may not use anything in that hand while flying, including weapons or shields.