Kobolds are ugly
spirits that originate from
German folklore. The most common version, known as
Hinzelmännchen, are described as helpful or mischevious household
elves. They sometimes perform domestic chores, but can also play tricks on the human inhabitants. This type of kobold is said to be related to
Robin Goodfellow and
brownies. Another type of kobold that can be found in
mines and other underground places seems to be more closely related to the
gnome.
Kobolds are also found in fantasy fiction. In Dungeons & Dragons and the settings it inspired, many authors present them as aggressive humanoid creatures that are smaller than a person. They are evil creatures that dwell together with their own kind rather than in human homes. Such kobolds have an ugly presence reminiscent of a bipedal rat or dog.