100 Acre Wood - Complete the “Starry Hill” episode. Atlantica - Complete the “A New Day is Dawning” song.
You will most likely have to farm enemies for a few hours in order to collect one of each necessary synthesis item, though having Lucky Lucky equipped during normal play can make this step easier beforehand.
Jump on top of the tram car that’s moving back and forth. Jump from the tram car onto the roof that contains a chest. Open the chest to retrieve the Orichalcum＋.
In order for the Orichalcum＋ to appear in your list of materials, you will have to exit and then re-enter the Moogle’s shop to turn it in as well.
