The scroll is a hidden item that shows you how to build a secret structure.
I've deliberately provided little information about it, to keep it something a player discovers rather then something everyone just builds.
To get the build instructions, right click with the scroll in hand.
If more help is needed just message me.
Best if you do via Curse as I'm not here often and these forms do not notify me of new messages. (https://minecraft.curseforge.com/members/ShetiPhian)