The Nightmare

Publisher's blurb:

In this adventure the characters wake up in a barren land, without any memories of how they got there. Without any clear escape route and left alone to fend for themselves in the ever-changing hostile world, they must prove able to survive the eldritch monsters that haunt them and finally escape from the dream-prison they are caged in.

This adventure includes optional custom rules to handle stress as well as a custom mechanic that allows your players to manipulate the nightmare they are trying to escape.