During the busy time for Chen Yu, his apprentice was naturally not idling either.
After spending a considerable amount of time studying Spatial Magic, Misumi Mikoto finally managed to shrink the palm-sized Magic Crystal, which was sealed with Space Fragments, down to a size that could be embedded into a ring.
In fact, it wasn't difficult, it's just that initially Misumi Mikoto had been researching in the wrong direction.
Although called a Magic Crystal, it is not actually a kind of mineral crystal, but rather a type of Magic Power crystalline that appears in an environment with a high concentration of Magic Power. It is called a Magic Crystal because it bears similarity to an actual crystal.
Due to its good Magic Power conductivity and capacity, in any magic civilization within the Multiverse, it is a very widely applied Magical Material.