Grade UpContents Guide
Each unit can be upgraded by spending Soul Fragments to strengthen its capacity, upgrades, and you can acquire new skills. Soul can be achieved through the sculpture is called Quest and the story of each unit, purchased from stores can be used. [Pure Soul Fragment]. Basically, the Soul Fragment is only used in the same unit, but the Pure Soul Fragment is an all-around piece that can be used in any unit. S-class and A-class Soul Fragments are scarce and hard to get, but Pure Soul Fragments can make up for the upgrade. Use is only available for upgrades, not during unit release. In addition, there are also Soul Fragments that can be used for certain classes of units or for certain classes.