This artifact was called the Tianzhai Palace, and although it was a Dao Integration-grade artifact, it could expand and shrink freely, and could also carry living people, which was rare.
Something like this could only be refined by combining temporal and spatial stones, and its value was considered equivalent to a ninth-grade Dao Integration-grade artifact.
The Lingwu Continent was vast, and many of the high-tier and top-tier sects and families were separated by millions of miles, if not more. In times of crisis, or during wars, the elders and guardians could tear open space to travel great distances, but most disciples could not. Therefore, these types of artifacts that could store living people were used to transport them.
