Remember Mistborn? The amazing world-building, clear magic rules, and complex characters? Imagine, just for a moment, the work needed to create an imaginary a world. For it to be believable you have to think about the geography, climate, wildlife, vegetation, culture, religion, political and social structure, race, economy, history, social issues, magic system (if applicable), architecture, clothing. I dare you, try it. Try to set all these pieces together and fit them perfectly for them to create a new world. 
 Now add complex, believable characters and an interesting story, so the readers love it. Take a moment to really understand how difficult it is to make it all work.... Give it a try 
 Ready? You have your world? 
 Now evolve it through time, in a believable way, maintaining the core structure that makes the world the same throughout the years. Evolve the civilization you created, taking into account how the world may have changed with it. 
 I don't know about you, but I think it extremely hard and I believe only a few may be successful at it. Brandon Sanderson has become one of my favorite writers, top five for sure. 
 Although steampunk is not my thing, I did love the story. The world has changed, civilization with it, but characters we hold dear from the first trilogy appear in the form of legend and religion. I miss them so much, but also felt as they were part of this new world too, in a new form. 
 Wax and Wayne reminded me of Sherlock Holmes and Watson... with guns, and magic powers, and badassness. Wax, a lawman who, after 20 years and a tragic event, goes back to the city (Elendel) and takes his place as the head of a powerful noble house. While trying to balance what he thinks is right for his house and missing the excitement of his old life, Wayne, his partner for 15 years, comes to the city seeking to involve him in new mysterious crimes. Railcars are being stolen in a mysterious fashion, and women are being kidnapped. 
 The characters are amazing and complex, their interactions funny, quirky and ironic. They are all lovable and interesting in their own way and I can't wait for the plot to evolve. That ending! My jaw dropped to the floor! (view spoiler)[ Marsh! And what does the book say? I'm dying of curiosity! (hide spoiler)]