The Sage Sphere is a class-changing item in Trials of Mana.
3D Version[]
Use : Angela's special item to switch to either Mystic Queen class if she has chosen the light path or Spellbinder class if she has chosen the dark path.
Source : Beat Shadow Angela in the Labyrinth of Ice in post game
Place to Buy : Nowhere
Buy : No
Sell : No
Monster Drops : None
Note : this item is exclusive to the 3D remake.