Goblins in the Sweat Lodge

From publisher blurb:

A bit of lore: Because goblins are like sand! They find a way to be everywhere and sneak inside all places. This adventure is about a small farming village that cannot enter their sweat lodge inside a cavern anymore. This is because a goblin shaman and his goons sneaked in and locked the door from the inside.

The sweat lodge ceremony is sacred for the people of the village. It cleans their souls and helps them cope with their problems. But they need the help of strong heroes. They cannot enter the cavern without risking harm.