The conventional Purification Skill has certain dispersing effects on pollution.
Originally, Hilia didn't know why the Purification Skill's dispersal could drive away the Demonic Qi, which also belonged to the same power.
It wasn't until Rose taught her the Purification Skill specifically targeting pollution that she understood that the way the Purification Skill worked was by fusing Magic Power and Demonic Qi together, turning it into another harmless kind of power.
However, the proportion of fusion between Magic Power and pollution is not large; only Divine Power can completely fuse with pollution.
Therefore, when a part of the pollution is restored, the remaining part is banished into the Abyss.
The Abyss is originally a place where the ancient gods banished pollution. With such a place, naturally, there's no need to spend time and effort researching how to restore pollution.
Or, no one is willing to restore it.
Specifically for what reason, Hilia did not know.
