From the introduction:
This contains three scenarios. They are largely self-contained scenarios but can easily extend into further consequences and other adventures.
Each one requires a McGuffin - some item that the party is tasked to recover - either because it’s intrinsically valuable or because some quest-dispensing NPC patron wants it. You can make up what the McGuffin is.
Eight Demon River requires the party to wade into the midst of a great battle on the titular river, in the Far East.
Temple of the Mantis takes place in a bizarre, mazelike extradimensional space, where the players must evade or defeat strange mantis priests to secure the McGuffin. I placed the portal to the Temple on the cold and unforgiving Northern Continent, near Vornheim: The Complete City Kit, but it can really go anywhere.
Wargenfels finds the party clinging to life on the back of a giant the size of a mountain. I put it in Broceliande (see Cube World 05: Warbox: Broceliande and Cube World 06: The Siege of Ortheque and Teeming) and I’ve included a few landmarks in the area around it, but it can go anywhere there are castles and mountains.