Similar to the Item Development system introduced in Hyperdimension Neptunia mk2, the player will need specific materials in order to create different modifications and items. In addition to requiring several materials, the player may in some cases also need to meet other requisites, such as attaining a certain Lily Rank level between two characters or increasing a nation's shares to above a certain value. By satisfying the criteria of the System File's requirements, you can incorporate that system into the game.