Rudyom's Wand

Rudyom's Wand at first looks like a totally useless device. The only thing it can do is to make Blackrock explode. However, at the end of Ultima VII, it becomes clear that without the Wand, the game can't be won, because the wand is the only way to stop the Guardian.

Rudyom in Cove tried to create a way, that would enable him to transform Blackrock to other forms. He hadn't much success however. The wand as result of his experiments only made the Blackrock explode, making him see it as a failure.

After the destruction of the Cube Generator in Ultima VII however, the Time Lord told the Avatar the true importance of this device. It was the only way to destroy the Black Gate, ensuring the Guardian couldn't enter Britannia. Retivring the wand, the Avatar used it to destroy the gate, thus saving all of Britannia.

The wand wasn't seen in Ultima Underworld II, but reappeared in Serpent Isle. However, it vanished because of a teleport storm. When the Avatar found it again, it had become useless, only making people sneeze. This was the end of this great device for the destruction of Blackrock.

Trivia

 * It is really curious, why the wand didn't appear in Ultima Underworld II, however, the most likely explanation is, that it would have been too easy to destroy the blackrock dome with it. Of course, the resulting explosion would have leveled Britain.