《X》是藝術家D.G. Lampaulus創作的第六本玄幻小說，這故事發生在一個架空的時空 "X" 當中。X 在數學領域是代表未知數，是代表一切的變數及可能性。
《X》同時也是 Nefelibata 雲行者第十張發行的專輯，共有23首歌曲與音樂。透過欣賞這張與小說同名的專輯《X》，讀者亦能感受到故事的波瀾起跌。另外小說專輯的主題曲《X》附有英文及中文版本，期望讀者能感受歌詞。
而推薦歌曲《01XY》；XY是人類的染色體，是生命的構成。0和1是數字的基礎，是數位世界從虛而實的編程代碼，也是宇宙最神秘的數字，這種最原始的數字及拉丁文卻構成了宇宙間的萬事萬物。
《Nefelibata 雲行者》Youtube頻道內容皆由藝術家D.G. Lampaulus的藝術與文學所提煉而出，從有聲書到音樂歌曲皆是D.G. Lampaulus的原創作品。
"X" is the sixth fantasy novel by artist D.G. Lampaulus. The story takes place in an imaginary time and space called "X." In mathematics, X represents the unknown, encompassing all variables and possibilities.
The album "X" is also Nefelibata's tenth released album, containing 23 songs and musical tracks. By appreciating this album named after the novel, "X," readers can also experience the ups and downs of the story. Additionally, the theme song of the novel's album, "X," is available in both English and Chinese versions, aiming for readers to feel the lyrics.
The recommended track "01XY" refers to human chromosomes, which are the building blocks of life. 0 and 1 are the basis of numbers, the programming codes that turn the digital world from virtual to real, and the most mysterious numbers in the universe. These primitive numbers and Latin letters form everything in the universe.
The content on the " Nefelibata " YouTube channel is all distilled from the art and literature of the artist D.G. Lampaulus. From audiobooks to music songs, everything is an original creation of D.G. Lampaulus.
《X》：
小說音樂原聲帶與專輯歌曲：KKBOX
小說音樂原聲帶與專輯歌曲：Firstory
小說音樂原聲帶與專輯歌曲：Spotify
小說音樂原聲帶與專輯歌曲：Pocket Casts