Due to the Secret Realm being sealed, Spiritual Energy does not leak out, coupled with the fact that most High-level Spirit Medicines can absorb and emit Spiritual Energy, increasing the density of Spiritual Energy in the Secret Realm. The richer the Spiritual Energy, the better the Spirit Medicine grows, thus forming a positive cycle. It can be said that the Secret Realm is the Spirit Medicine Garden for many sects and family alliances.
Baiyue Country also controls countless small and large Secret Realms because they need to cultivate cultivators from across the world, regardless of their status or aptitude. The demand is so immense that it's incomparable to sects and family alliances. Thus, even though the country possesses countless Secret Realms, it still falls short, which is normal.
