phenomen a book

In a world that plays out in the middle ages and magic, a guy finds himself on a mission after a year of peace and quiet. An escort mission to be exact. Under threat of those that he has to acompany, he finds out that even though it is not his problem, it might be beter to help them. The Gruges are under threat of war with one another, group against group. Both sides having their own powers will also make sure to abuse those. Not everyone they meet wil be friendly so they have to be carefull. Who will make it to see the end?