They are all around, bringing chaos and disease.
Wekufe were evil beings in Mapuche believed were all around. They appear as animals, natural events or disasters, or disembodied spirits – when they choose to be visible at all. Wekufe can be called and controlled by sorcerers, but they usually rebel against and kill any sorcerer who lacks the power to fully control them. The shamans of the Mapuche, called the Machi, had to work constantly to ward the corruptions of the Wekufe away from villages and innocents.
An Encyclopedia of Shamanism, Volume 1 on Google Books