Winter Solstice: Spiders emerge from Pidderack Shaft (#Nirmathas)

Every year, ethereal, dog-sized spiders emerge from a shaft discovered when the #Pidderack family dug a new well for their farmhouse nearly 2 centuries ago.
https://pathfinderwiki.com/wiki/Pidderack_Shaft

https://i.imgur.com/30q4xbu.jpg