Codex Coin

The Codex Coin is a item of great power. Not only is it capable to be sent to other worlds, but also it has the power to call the blue Moongate to Britannia and scare away dark powers.

Made by the Royal Coinmaker Sir Arbuthnot at the orders of Iolo and Shamino, it was sent to Earth to summon the Avatar in Ultima V. It was the last idea they had to topple Blackthorn's regime. The Avatar used it together with the Metal Ankh to open the Moongate and later to scare away the Shadowlords. The coin was never seen again after this event.

The Codex Coin as Trinket
In the original release of Ultima V, the Codex Coin was included in each issue. It was a real coin made of metal, exactly like the one in the game.

Ultima V: Lazarus
In the Ultima V: Lazarus remake, the Coin doesn't vanish and later is used to prove the Avatar's identity to Sir Arbuthnot. He also gives the Avatar a much more detailed story on the creation of the Coin.