In the book, the hero, while sleeping, moves to another world where he can acquire the skills and energy needed to increase the level. He can also give away energy. Humanity in the novel after entering the interstellar era was practically destroyed by another civilization but they entered into an agreement with the elves that helped humanity create several powerful warriors.
I don't remember the title and the hula novel is pretty cool.

    Have you tried looking in the genre for the book, it might make finding the book a lot easier for you :)

      Problem w tym, że nie jestem pewien w której kategorii to było... Czy miejski czy sf

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