Mythical Dragon Heart

This mysterious and mesmerizing obsidian stone houses a power within that is equal parts terrifying, tantalizing, and tyrannical. It is believed to contain the true essence of a dragon, the very definition of sinister strength and sovereignty. It is with this mythical mineral that the Mythweaver gained the power to transform himself into a living, breathing dragon and to dominate all of dragonkind as their new ruler.

What wonders could this coveted curiosity create in the right hands?