Use it in augmentable weapon processing. The basis attributes are retained. Unavaiable for the first synthesis or Lv0 augmentable equipment.
Item is used in Augmentable Equipment Forging, to keep the basic attributes on Soul items.
This means; The Soul item will keep its yellow, basic stats when this item is used, instead of it losing some and retraining some new ones from the other item that will be forged with it.