The moment Kanis entertained the possibility of Aksai possessing another storage treasure, several of the man's earlier actions suddenly began to make sense.
Spatial treasures were exceedingly rare artifacts, generally classified as Fourth-Order or higher.
Unlike ordinary storage rings, they could offer much more than a place to store belongings. Their owners could conceal trump cards, preserve valuable resources under special conditions, and even retreat inside them to establish temporary resting places.
Such treasures were also exceptionally difficult to detect. Unless their owners revealed them, even powerful cultivators would struggle to sense their existence. Furthermore, a spatial treasure couldn't ordinarily be restrained by a spatial lock of inferior grade, unless its owner lacked the cultivation necessary to fully utilize it.
Even in the Shinayin Empire, only two Nascent Soul Kings possessed such artifacts.
