I was really excited to dig into this, but the writing was erratic and full of typos and errors, the player hand-outs were wildly inconsistent from the book itself, and with all the text being exclusively Warden-facing so you need to improv or rewrite everything contained in it for a consistent or accessible experience: I really cannot recommend Under the Skin beyond exporting the neat idea for a monster to other modules or your own adventures: it honestly needs a full rewrite.