Dream 3: Magic school

I came to a magic school, a beautiful magical place yet confusing with a hint of darkness lurking...

With the help of the old friend as a guide, she lead me to a garden to see a wooden pedestal. I took out a pearl-like object from the pedestal to see, after she dropped a magic liquid on it, a glowing colorful bubble appear around the pearl, some dropped on my finger and also created a different bubble color.
Later in a tower with a spiral staircase, I found a beautiful purple-pink curtain, it glowing golden when light shine on it. I go inside, a large room floating in the clouds, with chess-like floor, a metal fence split the room in half, it's a prison, and behind the bars, a women - a witch.