[Magik]

If everything is made public then the "basic" trees with lore implications ought to also have lifted restrictions to app, too, just a lore gatekeep. If someone knows and establishes that occult is spookum corruptive magic give them the pass, etc.

(Also make tomes consumable items that just unlocks the tree in a menu for you assuming you can buy the starter, p l s. It takes up a significant chunk of your inventory real estate and it's not like you can drop them as is.)