After the Catastrophe, every rule in the world was rewritten. In the Age of Black Iron, steel, iron, steam engines and fighting force became the crux in which human beings depended on to survive. A commoner boy by the name Zhang Tie was selected by the gods of fortune and was gifted a small tree which could constantly produce various marvelous fruits. At the same time, Zhang Tie was thrown into the flames of war, a three-hundred-year war between humans and demons on the vacant continent. Using crystals to tap into the potentials of the human body, one must cultivate to become stronger. The thrilling legends of mysterious clans, secrets of Oriental fantasies, numerous treasures and legacies in the underground world — All in the Castle of Black Iron! Written by Drunk Tiger, this novel is a prime example of fantasy steampunk. Let us journey through the world of limitless possibilities and inventions together! ------ **Warning: This novel contains mature content**
"In this age, according to Chinese traditions, any secret knowledge that helps people promote all the way from LV 10 to LV 16 can be called sutra, which indicated its qualified, dignified position."
"The cultivation of visible and invisible surging points are too complex that it contains hundreds of billions of methods, which could not be concluded by humans after the Catastrophe without making any mistakes. Instead, they were the far-ancient cultural product that people discovered in the underground relics. That's why cultivation methods above LV 10 are very precious!"
Lan Yunxi continued to explain as Zhang Tie gradually understood the world of cultivation above LV 10. At the same time, a question appeared in his mind.
"Now that such a secret knowledge is so precious, why have I encountered many human fighters above LV 10. Have all of them gotten the precious secret knowledge?"