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Spell Substitution

Source Core Rulebook pg. 206
You don’t accept the fact that once spells are prepared, they can’t be changed until your next daily preparation, and you have uncovered a shortcut allowing you to substitute new spells for those you originally prepared. You can spend 10 minutes to empty one of your prepared spell slots and prepare a different spell from your spellbook in its place. If you are interrupted during such a swap, the original spell remains prepared and can still be cast. You can try again to swap out the spell later, but you must start the process over again.