In Wing's room, Gon, Killua and Zushi are being taught by Wing. He explains the 4 main principles: Ten, Ren, Zetsu and Hatsu. He demonstrates how Ren works, by giving Killua the idea of killing him. Because of the strong pressure, Killua is forced to back off. Wing advises them to train with Zushi and start mastering Ten but Killua suggests that they should leave. Killua reveals to Gon that Wing was lying all along as his teachings don't explain Zushi's extreme resilience he noticed while fighting him. Zushi is troubled because Wing lied to them. Wing only says that for them to know the other meaning of Nen is dangerous. After clearing the 190th floor, Gon and Killua advance to the 200th floor. They are stopped by a strong aura which makes them both wary. An employee appears, stating that they should register before midnight. Hisoka appears out of nowhere, and warns them that they are not ready yet and he won't let them pass. Wing appears behind them and offers to teach them the real Nen. Before leaving, the employee also informs Killua that if he can't register at the given time, he will never be admitted as he already failed to register for the 200th floor once as a kid. In Wing's room, he finally teaches Gon and Killua the real Nen. (Source: Wikipedia) Heavens Arena arc: (2/10)

Aired on: 4/21/2012