Consider Nightium as the free-to-play currency like Gold in other games which can be used for either powering up units, powering up equipment, buying things in the mystery shop, and leveling up Aurorians.
Maggie Red, Converter, Chain Spammer Mixing shy, timid and clumsy with explosions tends to mean an unhappy surprise for both the enemy and Maggie herself when they fight each other.
As it is obvious that a 6 star rated character will be stronger than a 3 star rated character, lower stars are judged within their own rating for more fairness.
Adds 10% true damage to Normal Attacks.