Create a new rule, “Staves”:

Each Apprentice holds a Staff, which may be Imprinted with a Spell. The name of the Spell Imprinted on each Staff is tracked in the GNDT under “Staff.”

As a Weekly Action, an Apprentice may Cast the Spell imprinted on their Staff without spending its Cost in Energy. They may do so even if that Spell is not Known to them, but must meet any other requirements for Casting that Spell.

Add a new subrule to “Powers” entitled “Imprint”:

Effect: The Caster may spend the Cost of [Spell] in Energy to change [Apprentice]‘s Imprinted Spell to that Spell.
Cost: 2

In “Spells”, change “a name of their choosing” to “a unique name of their choosing”.
If the Proposal titled “Magic Numbers” passed, give “Imprint” a Difficulty of 1N.