This is a well put together and balanced Bestiary, and it contains some of my favorite shadow creatures from past editions. Thses monsters will make your Rogue think twice about hiding in the shadows.
It is a great start to expanding skills in 5e. It is a little rough around the edges. Some of the rules need updated to 5e as already mentioned in a previous review. It is a strong start to an alternate skills system.
I agree with Alexander L's review about the content. I gave it five stars because the main reason he down graded it was the assumption that because the DnDNext playtest is over that the playtesting download is not accessible. His assumption is false. Since the items you need such as character creation rules and bestiaries are still available as a free download from the WOTC website. Not to mention they are easily found and signing up is a fairly painless process as well. So my only gripe and it is a very minor one is that the folks who wrote the description for this product should have made this clear in the item description.