While an alicorn, as known as Twilight tries to use her horn on her book to cast the spell perfectly, but then, the book started floating up in the air and spun around

"What's happening? I don't know what i did but did it complete?"

The book suddenly explodes into a purple aura, Twilight's body glows for a second, and her wings become bigger, and she becomes stronger. Her horn is now long as well.