The Eye of Dashi was a Shen Gong Wu that shot bolts of lightning.
The Eye of Dashi was a pendant with a red ruby in the center. The rhombus-shape of the pendant surrounding the ruby is a light brown color. The sides and the hole of the Eye of Dashi are black. On an occasion, the Eye is seen with a string to be worn on a necklace.
It released bolts of electricity and generated unlimited power into a desired object. Like other wu, the Eye of Dashi can be used in unison with other Shen Gong Wu and elemental powers and is arguably the most versatile wu in the series. When combined with the Sword of the Storm, it allows for weather manipulation, flight, and limited intangibility. When combined with Raimundo's wind element, it can create electrical wind storms strong enough to carry waves to surf on and engulf boats. Lastly, when combined with Kimiko's fire element, it's lightning blast is enhanced with intense fire energy that makes it capable of welding together wood or steel.
The Eye of Dashi was the main Shen Gong Wu of Grand Master Dashi, whom had defeated Wuya 1500 years ago. It was the first Shen Gong Wu to be fought for in a Xiaolin Showdown, as well as the last. It was named after Grand Master Dashi. Omi won it (along with the Mantis Flip Coin) in a showdown against Jack Spicer in Pillar Jumping.
Master Fung gave the Wu Clay for being the faster and to be used in the search for the Fist of Tebigong and used against the Jack-Bots, Clay wagered it in a showdown against Jack in Catch the Robin for the Fist of Tebigong, Although he didn't the Eye the Dashi during the Showdown but he did win the Fist of Tebigong along the Third Arm Sash.
Its power supply was also used to power Jack Spicer's Evil Time Machine that Omi used to travel back in time and meet with Grand Master Dashi to find a way to defeat Wuya when she was first returned to her body.
Jack later stole it again, but the monks got it back when they had a showdown with their worst fears and have had it ever since.