I'm playing on the latest fabric build and the only reference to ancient Scrolls is in the guidebook page for regular Scrolls, and though it looks like a link to another page, it does nothing when I click it, I cannot find ancient Scrolls in the creative mode inventory, I cannot find them in the jei inventory, i cannot /give them to myself and I cannot find them in stronghold or dungeon chests.

As a result of this I'm completely locked out of using great spells even in creative mode.

EDIT: never mind, i found some.