The so-called [Seven Curses].
They are curses and seals created by the seven most powerful Old Kings, led by the Worm God, residing in the Terminal North Continent, each utilizing their root powers.
There are two main purposes,
The first is to completely seal the Impurity Origin at the Deep Root Bottom,
The second is to completely deny contact between the creatures of the Terminal North Continent and below, any entity that wishes to approach the [Great Rift] will be influenced by the curse, either killed directly or marked and unknowingly hunted.
At present,
Even though the Ancestral Demon and all impurities have been transferred to the Demonic Exotic Domain,
The 'things' left behind below are enough to completely disarray the demons. If accidentally brought out, it may cause widespread contamination, even spawning a second class of "Impure Life".
Therefore,
The seals of the Seven Curses still exist.
