Keepsakes are special items that you can bring with you to activate certain bonuses like seeing a gods boons more often or getting an extra life. Some times you need to meet a specific requirement in order to bring the keepsake with you called the Fate’s Whim. Almost all of the time the way to get keepsakes is by gifting nectar to someone. There is only one where instead you must beat the chracter 2 times in battle to unlock the keepsake. If you wear the keepsake out a specific amount of times then it will increase its level and buff the effect given.