Dragons of a Fallen Sun

This book is about a few different things at once. It tells what is going on for a few different characters that, even now, have nothing to do with each other, apart that they all live on the same world. Mina, a girl who appears to be about eighteen, walks out of a fog that was created by a great storm that appeared out of nowhere. She walks into the camp of who is called by most "the Dark Knights" (The book also says that they prefer to be known as the Knights of Takhesis, Takhesis being their deity). She tells the Knights that she has come to spread the word about the one true god. She then proceeds to restore the arm of a Knight that had to be amputated in the past for a gruesome wound. This, along with mysteriously walking out of the deviastating storm, convinces the Knights to follow her wherever she goes.