And also with you . <| sep |> I ' d be down to bring them both to Denver and test that theory for you . <| sep |> Adding Spells to a Wizard ' s S p e l l b o o k spellstoawizardsspellbook In most cases , wizards charge a fee for the privilege of copying spells from their spellbooks . This fee is usually equal to half the cost to write the spell into a spellbook see Writing a New Spell into a Spellbook . Rare and unique spells might cost significantly more . In other words , the assumption made by the Core Rulebook is that other nonhostile Wizards will let you copy spells from their spellbook for a fee . It ' s a GM ' s discretion if they want to ignore that for their specific campaign , but unless you ' re in a world where magic is a jealously guarded secret I think it ' s a bit silly to say Wizards won ' t share their knowledge with other Wizards for a fee .