Memoria can earn experience by sacrificing other memoria. By leveling up a memoria, its stat bonuses will increase.
The experience curve is the same across different rarity, but higher rarity allows higher maximum level. Memoria's experience curve is an arithmetic progression, with each next level requiring an extra experience where n is the current level. The total experience needed to reach level n is equal to
Each copy of a memoria gives 100 EXP per its rarity level; occasionally it results in super successful, which gives 50% more experience, or more rarely, ultra successful, which gives 100% more. The probability of the bonus is not known for now.
Each memoria starts with a base level of 10, 15, 20 or 30 depending on its rarity; Limit Breaking memoria increases the cap by 5 each, up to 20 more levels.