Sceptre of Lord British

The Sceptre of Lord British, one of the three Royal Crown Jewels, is a powerful magical artifact. This powerful tool dispels any kind of magical force field, even the walls of the Shadowlords in dungeon Doom. It appears in Ultima V.

Description
The sceptre was left behind in Castle Britannia while Lord British was lost in the Underworld. Chuckles attempted to save the sceptre from Lord Blackthorn by giving it to a trusted knight to carry it to safety. Sadly, while in Trinsic, a Shadowlord stole the sceptre. The Shadowlords, fearing its power, stored it in their keep Stonegate. It was there, where the Avatar found it, guarded by deadly traps, the daemon Balinor, and even the Shadowlords themselves. Only with the sceptre was it possible to traverse Doom. It was not seen again in later times, but likely remained with Lord British.

Ultima V: Lazarus
In Ultima V: Lazarus the sceptre serves a similar purpose, although it can be retrieved from Stonegate without the help of the magical carpet.

Trivia

 * If a Shadowlord attacks the party while in possession of the sceptre, the Shadowlord steals it.
 * It acts like the dispel field spell, but does not require mana.
 * It's impossible to retrieve the sceptre from Stonegate without the magic carpet due to deadly pitfalls.