As the matter of fact, the cultivation of Inferno Body was more of a process of attracting the Fire Elementiums in the air and making them merged into the cultivator's body. Using them, the cultivator was able to temper and strengthen his Fire element innate talent.
Thus, during the cultivating process, the density of the Fire Elementiums in the surrounding environment played an important role in the speed of the cultivation!
If Leon was placed in a wet and cold environment like the Swampy Tower, the speed of his cultivation would be at least ten times slower. On the contrary, when he was cultivating in this underground lava pool where Fire Elementium was in an extreme majority, his progress in cultivation had simply skyrocketed.
The comparison between two different environments couldn't even be calculated with mere numbers!
