The Spire of the Hunting Sound

From the introduction: The player characters awake in the dry night air to a repeating musical tone, suffering from a terrible headache. They are prone on the upper deck of the Qi airship Aelestrian as it drifts a thousand feet off the ground. The captain and twelve other passengers lay around them. Some are unconscious, others are stirring, but all except the PCs are far from able to defend themselves. User summary: Free RPG Day 2017 "gold" product offering.