Tempest Shadow

Tempest Shadow is the secondary former antagonist  of the 2017 animated film, My Little Pony: the Movie. She is an unicorn who with a broken horn and scar and also the former second-in-command of the Storm King. She is voiced by the famous actor Emily Blunt. She helped the Storm King invade the entire land of Equestria in return for having her horn restored and haves Twilight Sparkle's and other Princess' captured to use their magic to make Storm King more powerful

Backstory
When she was a filly, Tempest and friend were playing in woods until they lost their ball in a Ursa minor cave. She went in to retrieve, but ran into the Ursa minor and it's attack left her hornless and scarred. Her destruction magic cost her friends to leave her. This made her hate friendship and specify it as meaningless

At some point, she met up with the Storm King and he told her that if she helped him steal the alicorn magic, he'd use it to restore her horn.

Personality
Tempest Shadow described as cold, merciless, and spiteful as a result of losing her horn. She is obsessed with having it restored and doesn't hesitant to punish others to accomplish this.

Movie
"Oh, I'm so glad you asked. How about we start with your complete and total surrender?"

"Here's the deal, ladies. I need your magic. Give it up nicely, please, or we make it difficult for everyone!"

"All this power wasted on parties when there are far greater uses."

"That princess is not gonna keep me from getting my horn back!"

"Silly little ponies."

"You do realize that if you were to shelter fugitives, the Storm King would be quite... explosive."

- To Captain Celaeno

"Now... I'm gonna count to three. And if you don't tell me where they are, your ship is going down."

"I'm nothing like you! I'm more than you'll ever be!"

- To Twilight Sparkle

"I saw the truth. My "friends" abandoned me when times got tough. Looks like I'm not the only one. Face it, princess. Friendship has failed you, too."