All Law Elixir

Ace's thief sense was restricted outside the cavern entrance, but the moment he entered the passage, he suddenly felt he had entered another space with its unique laws, just like when he entered the trial abyss. 

Furthermore, unlike the abyss, the laws here seem even more compatible, and his thief sense was suddenly fully released. But the biggest change was that he felt abundant Heavenly Qi in the atmosphere for the first time after he started cultivating. He was like a fist returning to water. 

Usually, heavenly Qi didn't exist in the atmosphere, and Ace had to use his cultivation technique to steal it. Then, with the help of the dark void, it would process and turn into heavenly darkness Qi, or the system would use the Qi materials to process them into heavenly darkness Qi and then release them into his body and soul.