A Tikoloshe is a South African gremlin. It has the ability to become invisible by swallowing water or a pebble. A Tikoloshe can be summoned to cause trouble for other people.
According to legend, the only way to keep the Tokoloshe away at night is to put a brick beneath each leg of one's bed. However, this will not protect anything but the person whose bed it is along with the bed itself, as it may instead cause havoc not involving said people. They get their power from a hot poker thrust into the crown of the body during creation.
While the Tikoloshe can become invisible this one should be an easy find. The cache can contain small trackables and trade items.