There is a book that I have vague memories of reading years ago. I can't really recall much about the plot except that the a teen boy was on a quest or journey of some sort. At some point a harpy is harassing him while he is out in the open area.
I remember bits and pieces but I recall some sort of separate world that he travels through with air elements (it seems they had actual names), I also recall either an ice castle or crystal castle. There was something within that castle.
I don't know if over the last 20+ years I have combined a couple books. I only recall reading two sci fi books that officially come from that section of the store and they were The Clerics Quintet (which I read about 9 years ago) and A Spell for Chameleon which I read during the time of this weird memory.
I keep thinking it mentioned 'chaos' but I have searched and none sound familiar.