What is your favorite writing craft book?

I love reading writing craft books, and I'm always looking for recommendations. What is your favorite one and how has it changed your writing?

My favorites:

* Writing Wonder by David Farland - takes writing magic systems, sci-fi, and anything inducing wonder to a new level * Million Dollar Outlines by David Farland - helps give a better understanding to what editors and agents are looking for in books even if you don't write the outline * The Emotion Thesaurus by Angela Ackerman and Becca Puglisi - great writing tool to describe emotions and their changes * The Emotional Craft of Fiction by Donald Maass - best book out there for emotions in my opinion * Writing the Breakout Novel by Donald Maas - honestly everything I've read by Donald Maas has helped give my writing better structure * Steering the Craft by Ursula K. Le Guin - this book helped me understand writing and its craft back when I was in college figuring life out * Bird by Bird by Anne Lemott - wonderful writing advice that I want to embody * Save the Cat by Blake Snyder - helped me understand story structure on a deeper level even if I don't always use the Save the Cat beat sheets * Writing the Blockbuster Novel by Albert Zuckerman - helped me structure my work and know what readers are looking for * most of Rayne Hall's writing craft books - her horror and gothic books on writing are absolutely fantastic, but I've loved everything I've read by her. She really knows her stuff and her books are easy to understand