After Gon and the others convince Killua to rejoin their side, Leorio and Kurapika depart temporarily for their own personal reasons, while Gon and Killua set for the , a skyscraper where thousands of martial artists compete daily in fighting tournaments, seeking to improve themselves and gain monetary rewards. There they meet a kung fu master named Wing who trains them in utilizing Nen, a Qi-life like energy used by its practicers to manifest parapsychological abilities, and is also considered to be the final requirement to pass the Hunter Exam. Sometime later, Gon and his friends reunite again in where they have a clash with the Phantom Troupe. During the occasion, two from the band of thieves are killed by Kurapika and he is forced to give up the chance of hunting down the rest in order to rescue Gon and Killua, who were captured by them, but not without succeeding in sealing the powers of their leader Chrollo Lucilfer.