Crown

For information on the Ultima V: Lazarus "Crown of Lord British", see this article.

The Crown of Lord British is an item of immense magic power. Whoever wears it, negates the use of magic by the foes of the wearer, or possession of the wearer and his/her friends. Even very powerful creatures like the Shadowlords cannot withstand its powers.

The Crown was the first item sized by Lord Blackthorn after corrupted by the Shadowlords. He hid it on top of Castle Blackthorn, behind a magically locked door, guarded by animated Stone Gargoyles. The Avatar however managed to regain the crown, using it on his/her quest to withstand demonic powers in dungeon Doom. After that, the crown stayed with Lord British.

Trivia

 * A little gag in the series is the fact that in no two Ultimas does the crown looks the same.
 * The Crown acts as an anti-magic field when it's worn, but only affects non-party members.