Rare alloys

Exploration Stage: Foggy Backstreet
From: Kira Woodville
Description: According to the notes of the collector who deciphered them, space bombs must be made with a special alloy. We have an idea what he is talking about. In prototyping the bomb, we need a rare energy sphere. Can you help us find it?
Completed: That's amazing! I am amazed that you found this rare energy sphere! It was made from an alloy of precious minerals from the city's mines. The collector himself went to the mine to dig for it. Each sphere is said to contain the energy of the fullness that has yet to be discovered.