- "Did you know the zeptocytes' original Golden Age purpose is a mystery? They escaped confinement during the Collapse, but their only visible effects on the environment have been on spinmetal deposits."
- — Ghost
Zeptocyte Cores are Legendary-class crafting materials used in the quest A Sword Reforged. It is used to turn the Legendary Sword Arc Edge into the Exotic Sword Bolt-Caster.. It is collected by harvesting Spinmetal on Earth, but is hard to find do to it being very rare.
List of appearances