Stygian

Stygian (Voiced by Bill Newton) is the alter ego of the Pony of Shadows in My Little Pony: Friendship is Magic. As recorded in the lost journal of Star Swirl the Bearded, the Pony of Shadows was originally a normal pony who brought the Pillars of Old Equestria together to save the land from a great evil. However, the pony soon became jealous of the Pillars' power and glory, and he stole artifacts from them in a quest for power, resulting in his exile. The resentful pony thus turned to darkness for revenge and transformed into the Pony of Shadows. In order to stop him, the Pillars sealed him in limbo along with themselves. A thousand years later, Twilight Sparkle and her friends inadvertently release the Pony of Shadows from limbo when they free the Pillars. The Mane Six and Pillars eventually track down the Pony of Shadows to the Hollow Shades. Before the ponies can banish him to limbo again, Twilight and Starlight Glimmer reach out to the real Stygian inside the beast's body. Stygian reveals that he never wanted to steal from the Pillars; he wanted to make copies of their artifacts so he could fight alongside them in battle. The Pillars realize their grave mistake, and together with the Mane Six, they free Stygian from the darkness and banish the darkness to limbo with the Elements of Harmony. Star Swirl apologizes to Stygian for letting pride cloud his judgment, and Stygian remains in the present era with the Pillars.