If you wanna spawn Shade Wave or if you wanna make Serpent’s Scale Perfected - Then you need the Book of The Gorgon’s Shade. 
I have 5 of these from when I was thinking about making Perfected Scales.
Hit me up here or ingame if you want one or all
Price for 1 = 2000ped
Price for all 5 = 7500ped (1500ped each)
Finally someone that knows the real crafting prices and sell them for a correct and honest offer. BUMP for you!
So that book is a consumable?
Well no, basically you need it the first time you summing gorgon’s shade - turning it in together with 20k sweat - After that you only need the sweat ?
Bump to the top - A few people interested but no closed deal yet
Sold