Gangyan Sand Crystal was no less precious than the rare materials Bai Linghan had helped Qin Fengming and the others collect. Its uses were even broader and more practical than those materials.
That was because it was used to increase the hardness and toughness of magic treasures.
No matter what kind of magic treasure it was, hardness and toughness were naturally among its primary measures. No one wanted their magic treasure to be destroyed after failing to withstand even a single blow.
There were naturally many materials in the Cultivation World that could increase toughness, but none could compare with Gangyan Sand Crystal.
Though it was mentioned in the Cultivation World's records, Qin Fengming had never heard of any genuine Gangyan Sand Crystal being passed down.
Gangyan Sand Crystal was secreted from within the bodies of Blazing Flame Insects, but that did not mean that the existence of Blazing Flame Insects alone could give birth to this sort of spiritual object. Gangying Stone also had to be swallowed by the Blazing Flame Insects.
Yet the enormous nest before him was actually constructed from Gangyan Sand Crystal. This was truly beyond anything Qin Fengming had imagined.
How many Gangying Stones had the Blazing Flame Insects needed to swallow, and how many tens of thousands of years had it taken, to form such a massive nest?
Slowly recovering from his shock, Qin Fengming also drew close to the enormous nest.
Through the viscous magma, he extended his spiritual sense to inspect it. Although this enormous Blazing Flame Insect nest appeared to be constructed from Gangyan Sand Crystal, a great deal of other material was still mixed within the Gangyan Sand Crystal.
But even Gangyan Sand Crystal adulterated with impurities was still so valuable that Qin Fengming was delighted.
With his superb refining