Engraves are savable random stats that can be applied to your Goddess armor and equipment. Each piece of equipment (both armor and weapon) has a maximum of 4 different lines. These lines differ in type, group, and value.
Identify Goddess Equipment through Appraiser Identification Shops or through the Appraiser Master NPC in Fedimian
Reroll to Desired Stats with Magnifiers or Sierra + Nucle Reroll
Save Engraves
Apply Engraves