Now for the novel. It is mainly High Fantasy. If you liked JRR Tolkien and Robert Jordan then this is the book for you.
The main theme is friendship as far as one person even goes on alone to get his friend out of captivity from protagonist. And then there are some others also who are on the same track but for a very different reason contrasting what friends do, people in need do and malicious people do.
The world is earth like but with magic, portals and a different geography then our own .Though it is still medieval fantasy.