Spooky DnD One-Shot Adventure - Spooky

Adventure one-shot ideas for horror or Halloween. Assumed to take course over the an evening or night. Probably with a full moon.

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The characters are a group of monster hunters chasing a shapechanger. One or more characters are dressed in costumes.
It is at an abandoned palace which is cursed by a deity.
There are angry locals talking of rebellion. And an imp seeks suitable servants for its patron.
At some point it starts or stops snowing.
As the adventure progresses there are hints leading to a great betrayal

The characters are local villagers spending the night here on a dare.
It is at an isolated village which borders on the Shadowfell.
There are bullywugs worshipping many-eyed creatures. And a cult fanatic is seeking a way to pay a debt due tonight.
At some point someone finds a mysterious riddle.
As the adventure progresses there is a series of murders

The characters are a group of recently met adventurers answering a noticeboard message to meet at the location. A character is haunted by a harmless ghost.
It is at a museum of curios which has a sinister pentagram that only appears on this night each year.
There are a mismatched group of awakened animals choosing a leader. And a creature here is possessed by a sentient berserker axe.
At some point something goes missing.
As the adventure progresses the time of a bloody ritual approaches

The characters are gamblers gathering for a "special" competition. One or more characters is currently cursed.
It is at a haunted monument which has a sinister pentagram that only appears on this night each year.
There are a gang of pirates investigating a dead body. And an imp seeks suitable servants for its patron.
At some point someone someone breaks into song.
As the adventure progresses a series of hidden tunnels are discovered

The characters are a group of recently met adventurers answering a noticeboard message to meet at the location.
It is at a magical ranch which borders on the Shadowfell.
There are a few angry outlaws enjoying intoxicating mushrooms. And a few creatures are inhabited by intellect devourers who seek new hosts.
At some point someone is poisoned.
As the adventure progresses there is a series of disappearances