[Mr_Rose]

It's each page in the book (or two-page spread in some cases); basically everything enclosed in the "scroll margin" page decoration. IE each entry in the scroll index is one scroll, so you can have two dragons in any combination of types/sizes, not two fire dragons and two emperor fire dragons etc..

I can't see how it could be any different, or you end up with a maximum of two griffons no matter what options they have and a maximum of eight, much rarer and more powerful, dragons not even counting the chaos versions, which doesn't make sense to me.