As Twilight sorted the books, deep in the back of her library she stumbled a pile of books in the darkness and slipped on the dusty, dirty floor, and tumbled through the thin sheetrock wall, causing a loud crunching noise, grabbing Spikes attention.
"Uh...Twilight, are you ok?" asked Spike from the loft. Twilight looked around, and noticed that she had stumbled into a sealed off room, she looked around an saw lots of books, their covers coated with dust, dirt, and cobwebs. She picked up a book and yelled back to Spike, "Yeah, I just tripped on some books and slid in to a wall." "Ok", replied Spike.
Twilight spend days reading and studying up on this subject of dark magic, know as "Alchemy". A few days after she read the books, she tried her first transmutation, she drew the circle in white chalk on the floor of the library, when nopony was around, she put a piece of paper inside the middle of the circle placed her hands on the rim of the circle, and focused her mind on turning that paper into fire.
At first, nothing happend, but then "fwhooosh" a little spirt of fire danced in the circle then dissipated. Twilight was amazed, her eyes sparkled with glee, as she cleaned up the transmutation circle, she erased the chalk and put the carpet back in its original spot.