Starlight Glimmer1 is the boss.

"Um. Twi? Why is there boss music?"

Thundering hoofsteps shook the castle. Twilight, wide-eyed, braced herself for whatever was to come.

"Mommy?" Sprout wandered into the room. "Have you seen my momma?"

The doors burst open as Phyllis Cloverleaf stomped into the room. "WHAT DID YOU DO THIS TIME, SPROUT? I THOUGHT I GROUNDED YOU AFTER YOU DESTROYED SUNNY'S HOME. NO TIME TRAVEL SHENANIGANS FOR YOU."

Sprout was then dragged out by his mother as the boss music faded away.