I know what is sounds like, but this isn't Harry Potter crap... the Nibelungs are a band of dwarves who live in Center Earth. Specifically they dwell in the city of Niflheim, the misty realm of the dead, under the rule of the goddess, Hel in the last of the Nine Worlds.
In Niflheim, there is a great well, called Hvergelmir, from which many rivers flow. It is also the storing place of the riches of the goddess, Hel. The Nibelungs have been specially commissioned to look after Hel's riches and treasures.
This item conjures the spirit of the Nibelungs from Niflheim. The spirit will unlock all of the mystic wealth powers contained in the goddess Hel's magical treasure. These powers will attract wealth and prosperity to your life in the form of money and riches, but always in spiritual abundance.