It's become indistinguishable, who is the cause and who is the effect after all.
The Immortal Demon Lord glanced at the remains of the Divine Turtle underfoot, vast power flowed from within him, cleansing the pollution from the Divine Turtle remains.
It took him a massive amount of soul power, barely able to wash the Divine Turtle remains to a level where they wouldn't become a source of pollution.
The remaining pollution would require a long time to wash away.
The Immortal Demon Lord chose to send the Divine Turtle remains to the past, allowing time to cleanse them and dilute the pollution.
The Divine Turtle remains were sent to the Divine Martial World ten thousand years ago, the supreme aura on them attracted the first demon entering the Divine Martial World.
Over ten thousand years, the mud and stones accumulated on the Divine Turtle remains, eventually turning into a floating island.
