Discovery of The Sheep Talisman
The Sheep Talisman was first sighted in the fifth episode of season one "Project A, for Astral". This talisman was discovered in a train inside a crate by Jackie. He was immediately attacked by Shadowkhan after discovering it. They take the talisman and throw it to The Enforcers, who are in a helicopter. Jackie eventually returns it to Uncle's Shop where Jade steals, and activates it.
The Power of The Sheep Talisman
The user of the Sheep Talisman gains the power of Astral Projection, or the ability to eject the soul from the body and wander as a spirit. In this form, one is invisible, inaudible, and able to fly, pass through walls, and enter a person's dreams (where one can be seen and heard). Shendu was also able to possess Jade when both of their astral forms had left their bodies. It's also shown one can use the talisman to eject the souls of other people other than the holder as Daolon Wong demonstrates. Despite all of its uses, it is next to useless in a fight, as both Jackie and Finn have stated
Later Findings on The Sheep Talisman
In "The Powers Unleashed" Jackie destroyes the talismans with a full power laser blast. With no host for the powers of the talismans, the talismans go back to the corresponding animal of their zodiac.