Hidden in the jungles below the fuming volcano of the Sky Lizard Mountains lie the ruins of Hisari, Chult's once mighty yuan-ti city, forgotten, abandoned and swallowed by the earth, surrounded by a magical ward that terrorizes all yuan-ti that dare return. Something happened. But no ones knows what. Explore the underground temple and be the first to unbury its secrets... if you survive to tell the tale.
Ruins of Hisari is an adventure for characters levels 11-16 and can be played as an expansion to Tomb of Annihilation or as a standalone adventure.