Feats, traits, items, all of the above. Thanks!

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    \$\begingroup\$ Related questions: raising spell DCs, raising spell DCs for a school of magic \$\endgroup\$ – MikeQ Dec 9 '18 at 3:57
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    \$\begingroup\$ Hi samuraiben! Welcome to rpg.SE! The community usually don't react well to asking a list question, especially when you only provide one line. Take a look at the related questions suggested by Mike Q, does it provide your problem? \$\endgroup\$ – Vylix Dec 9 '18 at 4:37