Key of Erebor
Few escaped the fire of the Dragon Smaug when he fell with death and ruin upon the Dwarf realm of Erebor beneath the Lonely Mountain. Even fewer expected to find King Thror or his son, Thrain, among the survivors, but the Longbeards had escaped the sack of the city by way of a secret passage. Centuries later, the precious key to this back door of the Mountain Kingdom would find its way into the hands of Thorin Oakenshield, grandson of Thror and heir to Erebor, and with it came hope of restoring his throne.
Both physically and magically a key can both unlock and lock things—we turn the key one way to keep things secret—turn it the other way, and we set it free. Keys can symbolize being initiated—giving access to knowledge that was previously hidden. Knowledge, of course, is power.
Wear this key around your neck and gain the magic power of the Dwarves!