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 (such as three 1st-level spells, a 2nd-level and a 1st-level spell, or a 3rd-level spell). A cantrip counts as one-half level for these purposes. The character prepare and cast 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.