The inscription on the weapon reads Pozhen Bawang Qiang (The overlord's spear that crushes armies). Shaoyu is very fond of this reward. Tianming and Yue-er enters a chamber where there are many bronze soilders and a huge bronze god. Suddenly the bronze men began to attack them. Yue-er realizes that the bronze god knows their locations through the weight on the floor tiles. Therefore she stands on her tiptoe at the border of the tiles. Tianming pulls the key to the back door from the bronze god, and they manage to pass the chamber. Yue-er finds the key to be the ultimate weapon of Mohist, Feigong(No War).

The original road suddenly cllapses and the three have to separate. Shaoyu walks into a chamber and the trap forces him to play a chess game, not the Go chess game in which the chessmen kill each other, but a reversi chess game in which the chessmen turns enemies to friends. Shaoyu was proud of his chess skill, but after a while he loses his priority and his life is threatened by the trap. He recalls his father's death on the battlefield, and tries his best to win the game. He finally wins the game and a weird weapon shows up before him.

The Music Box is the tresure of Yin-yang School, and it was somehow taken to Mohist School. The children realize they have to pass the test of the box to survive. A starry sky appears above them, and Yue-er finds out part of the secret with her knowledge about the Five Elements, the Twelve tones and Five sounds. She remembers how her mother has taught her to watch the stars, and find the vital star, the key to the test. Yue-er takes the box with her when they leave. Gongshu Chou manages to enter the Forbidden Land. The children come to a place with two roads. When they go to read the words separately, Shaoyu stands at the entrance to the Kingly Path, Tianming and Yue-er at the Chivalrous Path.

Shaoyu actually has acrophobia because of childhood accident, but at the last moment, he gets over his fear and catches his two friends. Tianming manages to pass the level and open the road that leads aross the abyss. The children see the murals about Jing Ke assasining the Qin Emperor. Shaoyu tells the story that no one survives Jing Ke's attack, but it's a mystery why the emperor survives. Chilian uses her poison to torture Duanmu Rong. Rong and the other Mohists gesture that they'll kill themselves if their friends try to rescue them. The three fall into a trap with rotating blades around them, and a fabulous music box in front of them.

Gongshu Chou shows Wei Zhuang a machinery man made of Wushuang's body. This human machine cleans away all the attacks from the traps. Wei Zhuang captures many Mohists and threatens to kill them one by one if the leaders don't surrender. In the Forbidden Land, the first level is called Tiger Leap, the player must have extraordinary strength and kong-fu to pass. The three pass the level thanks to Shaoyu. The leaders get awareness of the children's acts by watching the movement of the machines. At the second level Monkey Swing, when Tianming tries to pass the abyss, Shaoyu somehow drops Tianming's safety rope. Both Tianming and Yue-er are falling into the abyss.

Ge Nie and Jing Tianming are attacked in the desert. After fending the enemy troops off, Ge Nie is injured and is found, along with Tianming, by the Royal Tribe of Chu. They are then attacked by an assassin sent by Wei Zhuang.

The assassin is defeated by Ge Nie and the group takes off for an unknown area. Wei Zhuang dispatches Grey Wolf to deal with them.

Tianming had a nightmare about being separated from Yue-er (a foreshadowing). When he wakes up, Ge Nie realizes that the spell on Tianming has grown stronger. At night, Yue-er, Tianming and Shaoyu began their tour in the Machinery City. Shaoyu tells the others two about the Wei Zhuang and his assasins called "Quicksand" and "Reverse Quicksand". Datiechui and his two men are attacked by Yinfu in the jungle. One of the man is killed by Yinfu, the other who runs for help is killed by someone in black. Datiechui is also in grave danger.

When Yinfu is about to kill Datiechui, he is stopped by Gao Jianli. The three children arrived at a huge gate. Yue-er says the gate leads to the Forbidden Land, a very dangerous place of excecution, but the two boys don't take it seriously. With Xuenv's help, Gao Jianli wounds Yinfu badly. Wei Zhuang makes the Qin's armies clean away the traps. One of the Mohist machinery beasts, White Tiger, confronts Gongshu Family's machinery serpent. Gao Jianli believes Ge Nie has killed Jing Ke and thus suspects him to be a spy. Gongshu Chou asks for the scroll of the traps. Master Ban is attacked.

The one in black takes the key to the secret chamber. Shaoyu sends Tianming a message, asking him to meet somewhere, but Tianming doesn't know the characters. Gao Jianli sees Tianming and remembers Jing Ke. Tianming meets Gao Jianli and asks him about his father, but Gao Jianli gives no reply. The Mohists realizes someone has entered the secret chamber and taken the scroll. Tianming and Yue-er meet Shaoyu and Master Xu's Sword-founding Pool. Tianming somehow remembers he has seen the 1st-ranked sword Tianwen(Heaven Questions), the sword of Yingzheng, and knows the sword in in the Xianyang Palace. He can't clean up his train of thoughts no matter what, the spell on him attacks and Tianming goes unconscious. Yue-er decides to try treating Tianming with her inner strength.