Crown of Maze Navigation

While on the 7th level of the Abyss in Ultima Underworld I, the Avatar learned that the evil mage Tyball had errected a deadly maze, which was the only way to his lair. The maze was sadistic in that only one path would be safe, and stepping away from it would suck out the lifeforce of the unweary.

The Avatar however had also heard of a countermeasure and found the Crown of Maze Navigation in the treasures of an Imp. Wearing this crown, the normally invisible path became visible and allowed safe passage of the maze.

Trivia

 * To make it easier to find it: the crown in question is the only one with a white gem in the front.