Unlimited Upgrade System

2The orchids and the Ten Thousand Year Snake Plant had all turned into pure medicinal liquid. The corner of Chen Feng's mouth slightly raised. These three supplementary herbs had all been refined into medicinal liquid, and they were still being refined continuously in the pill furnace, completely removing the remaining impurities in the medicinal liquid. Only then did Chen Feng stop the purification!    

    

But at the same time, Chen Feng did not dare to stop at all. A piece of black wood suddenly appeared in his hand. Electric arcs were lingering on the black curtain, making Chen Feng's palm numb from the impact!    

    

The corner of Chen Feng's mouth raised slightly. He looked at the Thunder-Iron Wood Heart and said, "It's really mystical. This Thunder-Iron Wood Heart will become our cultivation resource today!"    

    

After saying that, Chen Feng threw the Thunder-Iron Wood Heart into the cauldron. Instantly, a wave of Chaos Fire wrapped around it. Chen Feng's eyes could see that even the Thunder-Iron Wood Heart was unable to withstand the burning Chaos Fire!    

    

It was as if being engulfed by the Chaos Fire and burnt into ashes, forcing the medicinal liquid out was inevitable!    

    

The corner of Chen Feng's mouth slightly raised. He quietly urged the chaos fire to roast the tough outer skin of the Thunderclap Iron Wood Heart!    

    

The outer layer of the Thunder-Iron Wood Heart was made of extremely hard and dense tree bark that contained the power of thunder. There were also layers of thick resin that solidified and formed a very tough layer of membrane!    

    

Although such a membrane was very hard, after being burned by a sufficiently powerful flame, the membrane would become soft. In the end, it would even become a fuel for the flame, helping to increase the power of the flame and helping to refine spiritual herbs!    

    

After thirty breaths, Chen Feng's eyes suddenly burst out with a bright light. Looking at the outer layer of the Thunder-Iron Wood Heart flowing with a layer of grease, Chen Feng knew that this was the resin formed from the hardened layer of the membrane on the outer layer of the Thunder-Iron Wood Heart!    

    

This resin was very combustible. When it was just formed, it had already been ignited by the Chaos Fire. Instantly, the Chaos Fire within the pill furnace's flame dragon burned even more vigorously and fiercely!    

    

The corner of Chen Feng's mouth slightly raised. He suddenly clenched his palm, and the fire of chaos within the pill furnace exploded even more. It was as if he had used all of his strength to roast and refine this Thunder-Iron Wood Heart!    

    

This Thunder-Iron Wood Heart was a divine object that had been tempered by the ancient tree for thousands of times. It was extremely hard. Even if the tough resin on the outside had been melted and melted, it couldn't be relaxed!    

    

The hardest part of the Thunder-Iron Wood Heart was actually the wooden part!    

    

It was also the tree core itself!    

    

A towering ancient tree that was only the size of a small arm, and the tree core that had been tempered thousands of times by the heavenly lightning, coupled with the wax from the oil, had become the Thunder-Iron Wood Heart!    

    

And at this moment, it was the hardest place to refine the Thunder-Iron Wood Heart!    

    

However, Chen Feng increased the firepower at this moment. Although the core of the tree was hard, it was still charred bit by bit. There were even some spots that had sparks appearing!    

    

"Humph, you're quite stubborn. Do you really think I can't refine you?"    

    

Chen Feng was very dissatisfied with the current refining speed. He directly raised the temperature of the Fire of Chaos to the highest!    

    

* Hong! *    

    

The sound of an explosion could be heard. At this moment, even the fire dragon in the cauldron showed signs of melting. Chen Feng was startled. He hurriedly lowered the power of the Chaos Fire to ensure that the cauldron could still be used!    

    

This time, Chen Feng didn't dare to be impulsive. He continued to refine the cauldron bit by bit.