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 Traveling through the world of Fairy Tail, Levi is bound to the sacrifice system at the beginning:
 1. Sacrifice all your emotional intelligence, break the life limiter, and become infinitely stronger!
 Second, sacrifice all your IQ and obtain immortality, which cannot be sealed!
 Third, sacrifice gender and appearance, imitate all living things, and transform all living beings!
 …
 After Levi sacrificed [Emotional Intelligence], a terrifying humanoid monster appeared in the world of Fairy Tail.
 Makarov: "Sir, I don't know whether the decision to bring him back to Fairy Tail is right or wrong..."
 Irene: "It's so enviable to be able to take the form of a human and perform the power of the Dragon King... My daughter, I leave it to you!"
 Zeref: "The Acnologia that I tried so hard to destroy... was actually killed by this kid with just one punch!?"
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