School of magic

I open my eyes and I am standing on the edge of a cliff. Then out of nowhere there is a slowly increasing buzzing sound. When I look up to the other side of the ravine I noticed something weird, it looks as if there is an invisible barrier of some sort. The buzzing is getting louder and louder. Deep purple cracks are starting to form in the barrier and it slowly starts falling apart. Then out of nowhere my hands shoot forward and a bright white light shoots towards the barrier. Suddenly my whole body is shaking, as if all its strength is being used. The buzzing is getting so loud it feels like my head is exploding and blood is starting to flow from my ears and nose. I feel my body starting to give up but my mind refuses to quit. I scream it out of utter pain, it's like my whole body is burning, as if struck by lightning. Then there is a bright purple flash and something lunges at me...