How can I improve this prologue?

At the very beginning you ask questions that begin with the word 'Or' and I suggest that you link these to the previous sentence e.g. "Can you hear the quiet babbling water or the soft whispers of the wind?" As a prologue it is very long but the writing is very good and I would make no changes to it at all except possibly to the term "They did a spell" find another word for 'did' such as 'cast.'. I would however suggest that you print it off and read it out loud or get someone to read it to you and you will hear for yourself whether you think that changes should be made. Good luck with your writing.