You get the Forgotten Scroll for Create Item lvl 10 (Vesper crafting) as a drop from all Beast Farm animals that have been fed with Golden Spice to Stage 2, regardless of species (Cougars, Grendels, Buffaloes, Kookaburras):http://v3.elliebelly.net/index.php?o...id=15&id=18249
And it drops at a very nice rate. Maestros in Taiwan and Indonesia got it within half an hour of hunting there. Even if that may have been luck, but you should have your book within one or two days at most.
did you tried correct mods for long enough?