Magic Ring

A magic ring that turns the wearer invisible when worn, and then rubbed. After it was used it disappears.

According to the Court Chronicles of Daventry, Graham accidently used the ring, but it saved him from an Ogre and a Dwarf. Other accounts claim that it was used to thwart the giant however.

Real World
Likely inspired by the One Ring of Tolkien fame.

The two accounts of the ring's use are due to the two versions of King's Quest 1, and puzzles being altered in the second. Derek Karlavaegen has been noted to claim that the original account is the most accurate story. But since the story is part of the mists of legends, both accounts have grains of truth.