Kahn took Fei away and began travelling with him, always trying to keep one step ahead of Grahf, who was tirelessly searching for them. Along the way, Kahn taught Fei everything he knew about the martial arts, but sadly, that wouldn't be enough. Grahf eventually found them, and when Fei turned into Id again, Grahf took control of him. Kahn pursued them across the world for three years as Grahf turned Id loose on civilizations such as Elru in order to cause chaos and destruction, as well to strengthen his abilities. Eventually, Kahn caught up with them. He defeated Grahf in combat and created a new personality in Fei to suppress Id. However, before Grahf's "death", he transmigrated into Kahn's body. Kahn's resilient mind and will were enough to temporarily resist Grahf for a time, but he knew he could not hold him back for long. While retaining control of his body, he took Fei to the remote village of Lahan and under his newly adopted guise of Wiseman, he left his son in the care of Chief Lee.
Over the course of Fei's adventure, Kahn was able to temporarily wrestle control of his body away from Grahf and appeared to Fei periodically as Wiseman in order to give him help and advice along the way. It is eventually revealed to Fei through Id that Kahn is Wiseman, who has been assisting him all this time. When Fei tries to reunite with his father, Grahf takes control once more and reveals to Fei that not only is he his father, but he is also his most dangerous enemy. When Fei and his friends finally defeat Grahf, he sacrifices himself in order to temporarily knock out the Zohar, which is powering Deus. All four personas perish when his gear self-destructs.