An excellent book of ideas, but the mechanical rules don't fall quite in line with 5e's design paradigm. The races aren't given enough oompf (+1 in two different stats, instead of the +1 and +2 that other races get). The feats are also a mixed bag, with some of them being weak or not following 5e design (particularly alternate vision).

The book isn't bad. The fluff/narrative bits are interesting, well written, and sure to inspire. But a lack of images, lots of white space, and rules that don't line up with the game in terms of wording or balance, all make me mark the product as just ok.