From The Introduction:
The Inn of Lost Heroes is a Labyrinth Lord™ adventure for 4-6 characters of 3rd through 5th level (about 15-20 levels total). This adventure was designed as a one-shot that can be dropped into any existing campaign. The party should ideally contain at least one fighter or dwarf, one magic-user or elf, one cleric, and one thief or halfling character. The adventure centers around an inn that has become trapped in the nightmares of a vengeful spirit. Escaping the inn is the primary goal of this adventure, however, resourceful characters may also find the courage to free the trapped souls of former adventurers and finally lay the spirit to rest.
Author’s Note: Know your group! This adventure begins by trapping the characters in an extraplanar dream world where some of the game mechanics they are accustomed to are slightly altered or do not work at all. It contains strong elements of horror as well as thematic material that may be disturbing to some. Common horror tropes of isolation, injury, and “taking the toys away” are also present. This is not an adventure that can be overcome by combat alone. If you suspect your players would not have fun with this type of setup, you may want to pass on running this module.