Crystal of Duplicity
Crystal of Duplicity is a crystal which Nystul used to copy the land in Felucca onto Trammel. Minax also used the crystal to be in both Felucca and Trammel. Lord British took it from Minax when she infiltrated Trammel. According to Ricardo's research that has been revealed during the In the Shadow of Virtue - Lost and Found Part 3 quest, the crystal is inside Castle Britannia near the throne room. Sherry the Mouse found the crystal at the vault in the begining of the In the Shadow of Virtue event cycle and the crystal is retrieved using the words of power from Ricardo's research. The Crystal is currently on display inside the Castle Britannia throne room.