As Huang Xiao refined his true qi and demonic qi with heart fire, he also let the refined demonic qi flood his body, tempering his meridians and dantian, along with all his flesh and bones.
Huang Xiao could not help thinking to himself that after cultivating the Demon Refining Formula, using it to refine true qi should consume some of the demonic qi entering the body. That was precisely why Pang Yi and the others could endure for so long. Ultimately, however, a greater quantity of demonic qi poured into their meridians. They consumed some and retained some, and as it accumulated over time, they would eventually reach a point where they could endure no longer. That was when their demonic qi infusion ended.
Now, he was taking advantage of this very principle, and dealing with the demonic qi pouring into his body even more thoroughly than the Demon Refining Formula could.
"The supply can't keep up with the expenditure!" Huang Xiao discovered with shock that after he ignited the incoming demonic qi with heart fire, the rate at which he refined new demonic qi could no longer keep pace with the rate at which the refined demonic qi dissipated after transforming his meridians.
Continuing like this would not cause any problems. It was absolutely safe; after all, no demonic qi was accumulating inside Huang Xiao, so naturally he would be unharmed.
But this ran counter to Huang Xiao's original aim of improving his strength as much as possible, which was also the fundamental purpose of entering Demon Refining Valley.
He needed to endure the demonic qi infusion for as long as possible, holding his ground at the optimal position for his realm.
*Never mind enduring a mere day here. As long as I don't starve to death or completely