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.
D&D
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.