Human studs.
Or, one could say, human trees. It sounded like its name: treating humans as trees, planting them one by one and letting them grow by themselves, and then reaping the resulting fruit.
From the moment that Lu Sheng thought of this, he could faintly sense tiny threads of Qi rising upwards from everyone present.
This Qi was like a fog or smoke, and was extremely faint. If it weren't for his extreme sense for energy, he wouldn't have been able to detect it at all.
Lu Sheng looked up. Everyone, including Cheng Kongzi, was giving off multiple threads of this strange Qi.
All these threads of Qi came together to form a faint little lake above their heads, flowing and turning.
"This is…!?" Lu Sheng stared at this tiny lake.
The transparent lake of Qi spanned across everyone's heads, rippling and flowing like a real, liquid lake.
"Now, imagine the rising sun, absorbing all the colors of light…" Cheng Kongzi raised his voice.
Small change in terms: finding (your) own Qi was changed to sensing Qi