Nordic Horror Roleplaying
From the introduction:
Throughout history, supernatural vaesen have lived side by side with the people of Scandinavia. But these creatures are not perceptible to human senses – unless they choose to be. Invisible, they have helped out on farms, assisted in calving, made sure that stray ewes find their way home, and kept people safe during harsh winters or wildfires, in exchange for some of the farms’ milk and grain. Vaesen have filled the fields with flowers, shown the way to ponds where people can see their future reflected on the surface, and whispered dreams into the ears of the sleeping.