MTL - From the Dungeon, Slaughter the Demon Apostle - Chapter 648 Strange Purple Magic

Because of his own carelessness, Duanmuhuai crossed into the world of the game “Xinghai OL”. Starting from a small core cabin, Duanmuhuai crossed the galaxy, traveled to countless worlds, awakened the power that had long been dormant, and fought against the hidden depths of the universe. The threat to dominate the galaxy!

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- Description from novelbuddy

One day, a tower appeared in the skies of all the major cities…

Upon meeting the girl who would become her adopted younger sister, the duke’s daughter Christina regained memories of her previous life. Through those memories, she learned that her new sister, Mishuli, was the heroine of a certain story. And though the story depicted a Christina who abused her sister, the real Christina turned into a siscon who spoiled Mishuli to no end.