Jiang Feng was instantly ecstatic. He had once read in a book titled *Records of Marvels* in the academy's library that naturally formed spatial items were extremely rare in the entire world.
While both served a storage function, a Spirit Ring was forged by using mithril to craft a ring and then carving spatial arrays onto it. Its capacity varied depending on the quality of the mithril and the grade of the arrays.
A purely natural spatial item, however, was fundamentally different from a Spirit Ring in that it could store living creatures! Furthermore, its capacity was completely fixed and could not be altered through any other means.
Chapter 395