The Double Medium.Mikihisa explains that 13 years ago, when Yoh and Hao were about to be born, he, Yohmei, Kino and Keiko (the boys' mother) were aware that one of them was Hao's resurrection, but they could not tell the villain from the innocent child, so they decided to execute both at birth. However, Hao was born already too powerful and avoided the attack, severely burning Mikihisa in the process (which explains his bird mask). Before leaving, he warned them Yoh was his other half and he would return to retrieve it one day. Despite this, the family was happy, since Yoh's sacrifice was avoided. Meanwhile, Amidamaru starts a process of evolution after which he will reach a sacred spirit status. The X-Laws appear and Lyserg invites Yoh's group to join them to compensate for their sin of acquiring Hao's power and help Jeanne built the Gate of Babylon, which, according to them, will erase all evil from the Earth, including Hao. They refuse, and the X-Laws attack them. Ren, Horo-Horo, Ryu and Chocolove become their opponents while Yoh waits for Amidamaru to be ready and Faust takes the rest to a safer point. When Amidamaru is finally done, Yoh forms a new oversoul, Spirit of Sword, that takes the form of a giant light sword and defeats the angels. The X-Laws leave and Anna explains Yoh has just learned how to use a double medium by incorporating Amidamaru in Harusame and then merging it with his new sword, which is called Futsu no Mitama no Tsurughi.