Bogeyman

A malevolent creature from folklore. Some of them are merely troublesome and rather harmless, but others are truly evil. They are shapechangers, they move objects and cause disruptions. Although a bogeyman usually haunts a family, in some cases it can become friends with them and a playmate for the children. The bogle is a more evil type of bogeyman, although it usually harms only liars and murderers.

The bogeymen are vague and amorphous in appearance and they resemble a large puff of dust. A bogeyman can be spotted by quickly looking through a knothole in a wooden partition. If there is a bogeyman on the other side, one might catch the dull gleam of his eye before he has time to move away.