Xie Xingchen's smile faded as he asked, "How did you figure out that we are not from this world?"
"You lack Heart Blood." Ji Qiankun said.
Xie Xingchen was taken aback; of course they had what they considered Heart Blood, but the Heart Blood Ji Qiankun spoke of was clearly not the same thing they knew.
After that, he remembered Ning Jie saying that the first Realm of cultivation in this world was the Blood Tempering Stage...
"What exactly is Heart Blood?" He humbly inquired.
It wasn't until then that Ji Qiankun revealed a faint smile, "Cultivators of our world, when they first step onto the path of cultivation, must temper their blood. Only by refining one's primal essence into their Heart Blood can they be considered to have entered the doorway of cultivation."
"Oh." Xie Xingchen nodded, "That move you just used, did it involve using Heart Blood?"
"Correct, including the Curse Blood Mark on your bodies, which is also refined from Heart Blood."
