"Centuries ago, a seemingly immortal yuan-ti warrior known as Xiuhcoatl, the Emerald Cobra, ruled over the vast Eztenqui Jungles with an iron fist. Finally, a wizard managed to end the evil serpent's reign of terror by trapping its life essence in a magical staff. The staff became both the figurative and literal heart of Voltigeur, resting in an enchanted case in the center of the town as a symbol of victory. But now the magic staff has vanished. Since the disappearance, merchant caravans traveling to Voltigeur have been savagely attacked. The few survivors report that their attackers were serpent-men swearing fealty to the reborn Emerald Cobra! Legends speak of an old pyramid near Mount Icpitl that was once the Emerald Cobra's palace. Can the heroes locate this ancient ruin and destroy the reborn Emerald Cobra?"