Ring of Gyges

Origin
A golden ring dating back millennia, it was said to have been found in a disturbed tomb of a giant by a humble shepherd, Gyges of Lydia. Upon discovering what the ring could do, Gyges seduced the queen of his land, and they killed the king so Gyges could rule.

Effects
Wearing the ring, which adjusts to fit the user's fingers, allows the user to become invisible when it is turned on the finger. With enough willpower, parts of the body can be made to appear and disappear. However, it also promotes the lowering of moral standards, making those who wear it feel more tempted to do things they should not do while invisible.

This is one of the artifacts that Agents covered up with the writing of “Alice's Adventures in Wonderland”, inspiring the character of the Cheshire Cat. Agent Wells also saw the effects at work on a fellow agent during her employment and used it as an unofficial source for another novel, “The Invisible Man”.