Spooky DnD One-Shot Adventure - Spooky

The characters are travelers looking for a night's shelter, after their coach had an accident. One or more characters has an inquisitive pet.
It is at an eerie palace which has stone statues in every corner.
There are a group of monster hunters seeking a wraith. And a vampire bound to the area is looking for a suitable partner.
At some point there is roll of thunder and flash of lightning.
As the adventure progresses cowled strangers begin to arrive

The characters are friends and family of an adventurer, gathered for a wake. One or more characters has an inquisitive mount.
It is at an abandoned palace which is home to several sinister owls.
There are a family of mimics who have recently moved in. And a hag is looking for a soul to complete a ritual.
At some point someone is poisoned.
As the adventure progresses people fall ill

The characters are scholars researching a local mystery. One or more characters are infected with lycanthropy.
It is at an elemental sea cave which borders on the Shadowfell.
There are a variety of kobolds, sprites and other small-sized creatures attempting to contact a mysterious being. And the ruby titan wants to establish a base in an isolated underwater city.
At some point they spot a lone enemy scout.
As the adventure progresses there are signs of a great evil approaching

The characters are the crew of a ship who have heard of a party happening here.
It is at a grove of trees sacred to a local religion which is built on the site of an ancient graveyard.
There are a mismatched group of intelligent animals choosing a leader. And an artifact is searching for a suitable bearer to take it away.
At some point an npc betrays the characters.
As the adventure progresses people start dying in different ways

The characters are students who have heard of a party happening here. A character has a treasure map of the place, promising "a great reward".
It is at an annual fair which is infested with bats.
There are a family of gnomes holding a funeral. And a hag is looking for a soul to complete a ritual.
At some point someone arrives in hooded robes.
As the adventure progresses there is a series of murders