The orb in this activity is mainly aimed at enchanted weapons and enchanted arenas. As for the acquisition method, it is exchanged through the activity npc Beat Ruiqi.
Exchange materials:
The faint ball in the arena has 60 different medals and 10 refined space-time stone.
The arena sphere is 150 heteromorphic medal and 90 refined time and space stones.
The total membership of these spheres is 2 points lower than that of a single sphere, and the difference should not be particularly large, so I suggest you choose the total membership of 10.