He said bitterly, "Do we really need... do we really need Yin-Yang blood to activate these spirit-controlling insects?"
Huang'er asked curiously, "What is Yin-Yang blood?"
Before Sanye could answer, Gongsun Qitian started to explain.
"Yin-Yang blood refers to the blood of a couple or lovers who have been intimate with each other, blending together physically and emotionally," he said. "This combined blood can produce a certain mystical power, activating the spirit-controlling insects."
Young Master Feng continued, "After activating the spirit-controlling insects, feed them to the creatures you want to control, whether they're venomous insects or giant beasts. As long as they consume enough of the insects, they will obey your commands."
"But there's a time limit, roughly five to six hours. That period should be enough."