2 more chapters will be posted today to not get confused about the events.
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Lilith, inheriting the entire memory of the previous "Mother of Miasma," felt herself drawing closer to re-sowing the will of the Miasma across the land, bringing back the glory of the old era.
The reason the first generation failed was that under the guidance of the despicable Emperor, more and more beings stole power from her, becoming Eclipsed and leading to her death from her own strength.
Learning from the first generation, Lilith realized that to beat an enemy, one must become the enemy. That's why she didn't reincarnate in the original form of the "Mother of Miasma." Instead, she chose to bewitch one of those around the Emperor and eventually took over the body of the Elf Empress, resurrecting in the image of "Miyuki."