DIAMOND if you like it!King Sombra is a male unicorn who is the antagonist in the third season's premiere, The Crystal Empire. Princess Celestia tellsTwilight Sparkle that he took over the Crystal Empire a thousand years ago, but was banished into the arctic. Sombra put a curse on the Crystal Empire which made it vanish into thin air. When the Empire returns, so does King Sombra, and he attempts to take over it. He is thwarted by the Crystal Ponies' use of the Crystal Heart. His entire dialog repertoire consists of growls, snarling, hissing, menacing laughter, and five lines of dialog.