A precious item possessed by Chu Chaoxun (and coveted by Wen Yue). The space inside is vast, containing water and soil for farming, and can even allow people to enter. It cannot expand any further. Wen Yue swore to snatch it after rebirth. In the previous life, Chu Chaoxun relied on it for a prosperous life, stockpiling food, drinks, and daily necessities.
