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True Core Mask
Item obtainable from GFL Anniversary Login Event, or by completing a Main Story Event, that lets you trade it in for a 5★ T-Doll of your choice, or a special icon only obtainable by using this item. The infographic below shows the usual recommendation for new Commanders. Some Commanders may prefer to choose M91/38 due to her exceptional use post chapter 10, whereas SAT8's usage is rather limited.