The bloodline seal—back when Chang'sheng first discovered Blackie's bloodline might not be ordinary, and could be connected to the Nefarious Demon Region.
While strengthening Blackie's bloodline, Chang'sheng also placed a seal within it, so when Blackie tried to use his bloodline power in normal times, he couldn't fully unleash it!
This way, unless someone fought Blackie face-to-face and sensed his bloodline power personally, they wouldn't be able to detect it from afar.
Just like when Xin Hongyi attacked Blackie in the Wilderness Realm—when they fought at close range, Xin Hongyi knew Blackie's bloodline power was related to what the Demon God Emperor had spoken of.
But now, in the Nine Netherworld Underworld Palace, such worries seemed unnecessary.
Besides, the Nefarious Demon Region probably already knew about his bloodline issues.
Thinking of this, Blackie shut his eyes and the surging dark demonic energy started converging toward his heart.
