The character prepares or retains additional spells. In either event, the spell or spells prepared or retained fade after 24 hours (if not cast).
Pick one of these two versions:
Prepare: the character prepares up to three additional levels of spells. A cantrip counts as one-half level for these purposes. The character prepares and casts these spells normally.
Retain: the character retains any spell up to 3rd level that the character had cast up to 1 round before the character started casting the mnemonic enhancer. This restores the previously cast spell to the character's mind.
Focus: Worth at least 50 gp.