Simply put, before exchanging for Rule Crystals, one first had to qualify for the exchange. Only after spending a hundred Contribution Value would one gain the right to exchange for Rule Crystals.
Every Heavenly Material and Earthly Treasure within this Bronze Cauldron had a prerequisite. Once one met it, one could exchange freely.
How should this exchange rule be described? It would motivate the Dao Integration Realm cultivators present to slaughter Black Demons with all their might in order to obtain the Heavenly Materials and Earthly Treasures they needed.
But hadn't this Bronze Cauldron appeared here to let the Dao Integration Realm cultivators improve their strength somewhat?
Setting such a threshold was equivalent to making the possibility of immediately improving one's strength vanish outright.
The Bronze Cauldron's spirituality always displayed strange, perverse behavior. No one knew whether its spirituality had been contaminated by the Heart Anomaly Realm or manipulated by the Black Demons.
Or perhaps the Bronze Cauldron simply did not wish, at heart, to give these Heavenly Materials and Earthly Treasures to the Dao Integration Realm and Heaven Opening Realm cultivators present.
After all, these supreme treasures had been prepared for the descendants of the Devouring Yuan Clan, so they could rise again from the ashes.
Chen Fei shifted his gaze away from the Rule Crystals and looked over the other Sixth Order Spiritual Materials.
Chen Fei actually possessed most Sixth Order Spiritual Materials, after all, he had killed so many Dao Integration Realm cultivators.
Seventh Order Spiritual Materials were difficult to find in the Black Stone Domain, but most Sixth Order Spiritual Materials were still produced there. Otherwise, the number of Dao Integration Realm cultivators in the Black Stone Domain could not previously have reached such heights.
Suddenly, Chen Fei's expression shifted slightly. All his attention had just