Accidentally reincarnated into a magic book

Because he was playing with his mobile phone on the road, he accidentally died in a car accident-it should have been like this.
However, after waking up, he found that he had been reincarnated into a magic book.
Well, it looks very powerful, but why is it a magic book? !
Moreover, he was reincarnated in the abyss maze known as the most difficult in the world. It was in hard mode when he first came, so he let no one play?
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