The Black Fog used to be a pony but was were turned into fog and he resumed the name The Black Fog. He's a very dangerous villain who has the power to turn into a fog and no one can follow him in the sky. The Black Fog uses this for his own purposes.

Celestia has been taken over by a evil spirit and is lanching an attack all over Equestria. She takes Luna, Cadence, and Twilight captive to prevent any revolts. is this the end of freedom in Equestria?