Adventure one-shot ideas for horror or Halloween. Assumed to take course over the an evening or night. Probably with a full moon.
The characters are gamblers gathering for a "special" competition. A character is celebrating a special anniversary.It is at an abandoned palace which is full of mirrors that sometimes show strange scenes. There are acolytes of a local temple attempting to contact a mysterious being. And a creature here is possessed by a sentient berserker axe.At some point someone goes missing.As the adventure progresses a series of hidden tunnels are discovered
The characters are a circle of spellcasters hunting for mirror. A character is a shapechanger.It is at an ancient theater which has a large network of passages underneath. There are skeletons celebrating as if they were alive. And an artifact is searching for a suitable bearer to take it away.At some point someone finds a mysterious note.As the adventure progresses a series of hidden tunnels are discovered
The characters are friends and family of an adventurer, gathered for a funeral. Two of the characters have a bet about the evening.It is at an ancient theater which has an secret sacrificial chamber. There are a pack of welcoming ghouls preparing for a feast. And a vengeful warlock seeks to burn everything to the ground.At some point someone finds a mysterious riddle.As the adventure progresses more and more things light on fire
The characters are a novice group of adventurers looking after the place for a night. A character is accompanied by an annoying friend.It is at a haunted shipwreck which is visited by a storm each night. There are hooded snake cultists initiating new members. And an artifact is searching for a suitable bearer to take it away.At some point a portal to another realm opens.As the adventure progresses people start to break into a terrible chanting
The characters are travelers looking for a night's shelter, after their coach had an accident. A character thinks there is a big conspiracy.It is at a grove of trees sacred to a local religion which is infested with rats. There are goblins who worship spiders, preparing a sacrifice. And a shadow dragon wants help entering from the Shadowfell.At some point an npc betrays the characters.As the adventure progresses people start dying in different ways