In Norse mythology, the Vanir are gods associated with fertility and wisdom. Fast-forward to the 19th and 20th centuries, when the United States saw a major immigration from Europe to the continental Midwest, drawn by low prices for farmland.
These elements are thrown together in the episode “Scarecrow,” where a couple vanishes into an apple orchard, in a town with exceptionally good luck and health. Drawn by the disappearances, the brothers find that the town has kept some ancient, vaguely pagan roots. In exchange for two sacrifices, the town is blessed. The sacred tree is burned, saving future victims, but leaves the town’s future uncertain.