Even after causing such a disturbance, the mysterious Warden Zuo did not appear, rumored to be in seclusion somewhere within Sky-north Prison. However, he didn't need to appear personally, as long as he connected the Dao with the prison, he could trap all the demonic creatures within it.
As for these powerful demonic creatures, the reason the Imperial Court imprisoned them instead of slaying them was that most of them still held value.
Having cultivated to such a strong extent, whether it was their Divine Skill Methods or mystical treasures, all could be extracted as wealth. The information they knew about other demonic creatures could sometimes play a crucial role as well.
But that didn't mean the demonic creatures in Sky-north Prison wouldn't die; on the contrary, quite a few would silently perish each month. They died from harsh torture, failed escape attempts, or even suicide…
