Canon: Wizards must have a staff as a focus object
In the next campaign, all wizards will get a staff at start to use as a focus object as per Arcane Bond. This will NOT preclude wizards from also having a familiar.
This is something I’m stealing from Bob (he did something like this a while back) but it seems right. There’s Tolkien lore backing it up, so there you go.
Wizard’s staves can (should?) have a backstory that’s intertwined with the wizard’s. Staves count as masterwork and may be ensorcelled.
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ALSO: every wizard must also choose a favored school of magic, with all associated rules, to wit: https://www.d20pfsrd.com/classes/core-classes/wizard/#Arcane_School “A wizard that chooses to specialize in one school of magic must select two other schools as his opposition schools, representing knowledge sacrificed in one area of arcane lore to gain mastery in another. A wizard who prepares spells from his opposition schools must use two spell slots of that level to prepare the spell.” You may select Universalist school.