Wristwatch shield

In the Sea of Monsters, Tyson gave Percy, his Half-brother, a watch that, with a click of a button, turned into a sheild decorated with scenes of Tyson and Percy's adventures together. The Hydra, the Princess Andromeda, etc. Tyson had been making this watch himself. In the Titan's Curse, Dr.Thorn destroyed this magical item, and percy was devastated. Tyson, however, was glad, because he said, "Then the shield works!" In the battle of the Labyrinth, Tyson has the shield watch back to normal.