If there is indeed a more terrifying existence behind the demons, then it is understandable that the major forces of the Ancient Era were defeated.
"Indeed, I sense a certain special power within these ancient demons."
"If we kill them, it may lead to some bad consequences."
"Better to imprison them in the Ice Prison of the Spirit Ruins Realm."
"The Ice Prison in the Spirit Ruins Realm is derived from the Immortal Prison in the Immortal Realm."
"Imprisoning these ancient demons is a matter of ease; escaping back is fundamentally impossible."
The Exquisite Tower also agreed with this point.
It instinctively felt an aura of misfortune from these ancient demons.
Even it might not be able to refine such a terrifying force of pollution.
So it didn't intend to devour the flesh and blood of these demons.
Not everything can be consumed at times.
Some things, if consumed, would lead to stomach issues and would do no good to either side.
