Blood Dragon Stones were extremely valuable cultivation items that could help one rapidly comprehend their cultivation level.
Although Blood Dragon Stones were of the fire element, the fact that they were at the level of the great dao meant that they possessed intricate links with all other elements. Thus, even cultivators who didn't practice techniques of the fire element could use Blood Dragon Stones to comprehend the great dao. It was just that the effect would be slightly inferior compared to those who practiced techniques of the fire element.
However, Blood Dragon Stones couldn't be refined in one swift go, and one needed to slowly extract their essence bit by bit. The process was similar to that of refining Star Stones.
Now, however?
With a simple touch, Ling Han had instantly caused a Blood Dragon Stone to disintegrate into and turn ashes. Not a single trace of it was left.