Into Castle Duckenstein is the perfect adventure for a Halloween session, or any horror game you might be running for spooky season. It will fit perfectly in any campaign setting you’re using.
5e
The Dragon’s Aerie (5e Compatible Dungeon Adventure)
There are legends about an abandoned dragon’s hoard that lies at the top of a temple floating in the sky, where it was worshiped for its ability to control the wind, weather, and call storms.