From publisher blurb:
This adventure supplement is a special collaboration with another creator we feel fortunate to call a friend, Smitchellmaps. In Sorrow of the Mangled Prince, the characters stumble upon a terrible situation in Idralmas, a city close to the Forbidden City. The Forbidden City was once the royal palace of a bygone family. The place is shunned and thought to be cursed. But now, for some reason no one understands, children ran away from their homes and into the Forbidden City, and no one dares approach the place. The events have caused people to remember an old cautionary tale of a prince from a bygone era that was robbed of his legacy and became a spirit of hatred.
The characters walk into a dangerous place willingly under the promise of a nice monetary reward. They soon discover that the mausoleum compound under the Forbidden City is protected by deadly traps and undead guardians that fight with a strength and brutality that defies explanation. Within, they shall learn what happened to the mangled prince almost three centuries ago and whether it is possible to save the children in time or not.
This adventure takes the characters to the dangerous mausoleum of an ancient royal family, pits them against necromancy-infused guardians, and gives them the opportunity to earn renown and earn the gratitude of dozens of families.