The most recommended and highly regarded book for the strongest cultivation in the genre of xianxia is "仙逆" (Xian Ni) by author 耳根 (Ergen). This novel tells the story of the protagonist Wang Lin, who embarks on the path of cultivation after a fortuitous encounter. With his intelligence and perseverance, he overcomes numerous challenges and reaches the pinnacle of cultivation. "仙逆" is praised for its unique storytelling and enjoyable reading experience. It is considered one of the best xianxia novels in recent years.