It's a German unofficial game guide for WC4 - Loaf has it, as far as I know. I looked at it once in a shop, and quickly put it away again. But it's still on sale, and the outrageous artwork is someting of a collectors item..
Yup, there's all sorts of neat looking unofficial guide artwork in Germany (and some alternate official guide and novel covers). You can find more of it in the German Guides Guide that I did a while back: https://www.wcnews.com/articles/books-g.shtml