The Tokoloshe is a dwarf-like water spirit of Nguni mythology, mischievous and evil. It can become invisible by drinking water or swallowing a stone.
Malevolent people call upon tokoloshes to cause trouble for others, and witch doctors are said to have created them to harm enemies. The only way to keep the tokoloshe away at night is to put a few bricks beneath each leg of one's bed, raising it off the ground.