Of course, cultivating the Iron Armor Skill was also incredibly expensive. The Profound Gold Mountain Pattern Armor alone was worth nearly ten thousand taels of patterned silver. Furthermore, the cultivation process consumed a vast amount of Qi Blood Power, requiring one to eat Demon Beast Meat and supplement it with Great Qi and Blood Replenishing Elixir Pills.
However, Chen Cheng had already resolved these issues, so they weren't a problem.
[Iron Armor Skill Cultivation Progress increased.]
...
After reaching Muscle Strengthening Realm Perfection, Chen Cheng felt a major difference when he cultivated the Iron Armor Skill of the Muscle Strengthening Realm.
Previously, when cultivating in the Skin Grinding Realm, the higher his Realm, the tighter and tougher his skin became, making it harder to temper with the Iron Armor Skill and slowing his progress.
