Craft it
You need
Make it at (any of these)
Weapon WorkbenchWeapon Assembly LineWeapon Assembly Line IIAdvanced Weapon Assembly LineAncient Workbench
Needs a Pal with Handiwork. Best:Solenne (Lv 8), Selyne (Lv 7), Wistella (Lv 6)
Work: 13,000 · Unlock in the Technology menu at level 38 for 2 Technology points