Xiang Yu felt the qi in his dantian boil and bubble over, creating pressure like never before.
Then, when the process reached a critical point, it popped, dispersing all the qi that had been gathered within his dantian. Just like Li Yao, his spiritual root turned into a black hole and started sucking in all the qi around him, though at a much smaller scale compared to Li Yao.
Although his spiritual root was hungry, it was nothing compared to the qi being produced by the now immortal grade spirit vein.
Although the spirit vein had upgraded and now produced immortal qi, it still produced normal qi as well. Otherwise, Xiang Yu might have had some trouble since his spiritual root wasn't capable of refining immortal qi like Li Yao.
His spiritual root continued sucking in energy for over half an hour before it stopped. Xiang Yu exhaled to disperse the remaining energy before checking his status screen.
[Core Formation: 10th Layer (50,000/1,000,000)]
