Enchanted Hourglass

The Enchanted Hourglass is a magical artifact which allows its bearer to surpass various magical barriers, as well as creating a conduit through which they may speak with the Time Lord. It appears in Ultima VII

Description
The Enchanted Hourglass originally belonged to the magician Nicodemus, who sold it a small Pawsian shop run by the aging Beverlea when the distorted ethereal waves caused by the Tetrahedron Generator drove him to madness. During their first quest against the Guardian, the Avatar would have need of this magical device, that they might bypass the defenses of the Sphere Generator and thereby free the Time Lord from his imprisonment.

After purchasing or stealing it from the shop owner, the hero would have to take it to Nicodemus following the cleansing of the ether, that the wizard might be able to properly re-enchant it. Once this was done, they could penetrate the exterior of the blackrock sphere and thereby destroy it - after which the hourglass would serve to allow them to speak to the liberated Time Lord.

Trivia

 * If asked about his hourglass before the ether is cleansed, Nicodemus will not know precisely what he did with it, and will guess incorrectly that he may have sold it to Margareta of Minoc.
 * In the SNES Port of Ultima VII, the already enchanted hourglass is hidden within Sutek's Dungeon, and does not bear any relation to Nicodemus (who is absent from the game).