Fire, Ash, and Ruin

From the introduction: Within the jungles of Chult lay a vast expanse of ash. While a red dragon is known to reside deep within the Land of Ash and Smoke, it is far from the deadliest of its denizens. Deeper still lay a pit filled to the brim with pure evil. None who have sought out its secrets have survived to tell its tale. Will you be more successful than they?