Phantom Sphere of Sapphire is used to awaken & limit break SSR units and awaken SSR vision cards.
Phantom Sphere of Starbow can be mainly obtained when SSR units and vision cards from the Gacha are duplicated.
Campaigns and events also give you chances to get this item.
19 Phantom Sphere of Sapphires are required in total to awaken a UR unit to ★6.
9 Phantom Sphere of Sapphires are required in total to limit-break a SSR unit 5th times.
18 Phantom Sphere of Sapphires are required in total to awaken a SSR vision card 4 times.
UR Units & Tier List
UR Vision Cards
Sephiroth
Velis
Sudden Crash
Xiza
Viga