No one could possibly have a better excuse for not having read the cultivation pamphlet. Hoping that the question means something generally like what he imagines it to mean, Lan Wangji endeavors to answer. "Qi is the energy that sustains all life. It is in everything. Cultivation is the practice of gathering and refining that qi." He touches a hand to his abdomen. "I have formed a golden core, here, that serves as a store of qi. It prolongs my life and enables some feats that those with lower or no cultivation cannot accomplish."