Reprepare Spell Feat 18
Source Pathfinder Core Rulebook
You've discovered how to reuse some of your spell slots over and over. You can spend 10 minutes to prepare a spell that you already cast today, regaining access to that spell slot. The spell must be of 4th level or lower and one that does not have a duration. You can reprepare a spell in this way even if you've already reprepared that spell previously in the same day.
If you have the Spell Substitution arcane thesis, you can instead prepare a different spell in an expended slot, as long as the new spell doesn't have a duration. Once you've reprepared a spell in that slot even once, you can use your arcane thesis to substitute only spells without durations into that spell slot.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
WizardThis indicates abilities from the wizard class.