There is an awesome fantasy book by G. Akella that is free now. Akella is already known as one of the top LitRPG authors in the world. If you have ever heard of LitRPG, you probably know the series Realm of Arkon. The series has obtained thousands of fans all over the world. It has also been one of the top best-selling series both in the USA and Europe. So... Now the first book of the series "Patch 17" is available for free on Amazon. If you are not familiar with LitRPG and you like fantasy, sci-fi and some gaming/mmorpg (but not necessarily), this should be the kind of read that you'd like.