From publisher blurb:
No one knows where it came from. Townsfolk claim it just appeared on the cobblestone streets overnight. Its eloquently crafted box frame doesn't seem to follow the workmanship of the elves, dwarves, or any other people known to this world. Such a miraculous mechanical discovery for the citizens of Brenningr! At least, that's what they thought until they heard the enchanting music slowly taking over their now sleepy minds.
OBJECTIVE
Find out what has happened to the village people, what is the purpose of the enchanted music box, and who or what is behind all of this. The adventurers will begin their quest in the Visio Nocturna Regnum, or Nightmare Realm, where their sanity and wits will be put to the test. For only there can an innocent dream suddenly shift into a nightmare of a situation. Who will make it out alive and who will never wake up?
INFORMATION
This free DnD one-shot adventure is intended for a level-3 party, but can be adjusted to fit groups of a higher or lower level. The downloadable PDF includes creature stat blocks for convenience.