They understood the meaning of Old Cyan Dragon.
Maintaining the operation of various restrictions and arrays within the secret realm requires a huge consumption of energy.
Although the restrictions set by the master have long reached a state of perpetuity, drawing energy from the Endless Void to sustain themselves.
However, if the secret realm is closed, it can invisibly reduce a considerable amount of consumption, saving more spiritual charm for Lu Qing's cultivation.
And they have witnessed Ah Qing's cultivation, and his demand for spiritual charm is truly terrifying.
Each breakthrough of a small realm absorbs spiritual charm that even those in the Unity Realm Stage find astonishing.
With the current resources left in the Immortal Palace, it indeed can no longer support the needs of Ah Qing's cultivation.
So closing the secret realm in advance is indeed a good method.
