(Batman I #705 (fb) - <1929> In the Yangtze River Valley the Sensei tried to wield the Mask of the Beholder, a powerful mystic artifact, but was not worthy of it because he was not enlightened. The Mask caused the destruction of a village, and Sensei manipulated the Jade Compass Society into taking it into safekeeping until he could achieve enlightenment and use its power.

(Batman I #670, Robin II #168, Nightwing II #138) - Talia sent two men from the League of Assassins to Hong Kong to see I-Ching and they demanded to know how to find the hidden road to Nanda Parbat. He told them about the Book of Changes, and how it was the voice of the world deciding what course of action to take next. One of the men turned on the other, killing him, and and again demanding the path to the secret road, but Batman was hidden in the shadows and knocked him cold. Batman wondered what Talia wanted with Nanda Parbat, and asked why the men turned against each other. I-Ching reminded him of Sensei, who ran a splinter group of the League and could possess others. Sensei learned that Ra’s had come back to life, albeit temporarily, with his mind in the body of his chauffer Sam Tang. He could not allow the demon to get his hands on Nanda Parbat to find life unceasing. He assembled his Seven Men of Death, asking Hook and Merlyn how they should slay the demon. The Seven Men of Death brought Sensei two pieces of the secret map to Nanda Parbat. Sensei told his men the map pieces could be anything from a piece of parchment to a tattoo or pendant. He dispatched Merlyn to find one of the seven families of the map. Merlyn found the hermit entrusted with the map and shot him with arrows before getting a look at his birthmark. Sensei sent Hook and Maduvu to Singapore, where they located another keeper of the map. When Maduvu threatened to rip his wife’s unborn child from her belly he relented and gave them his piece of the map, which was a poem. Sensei received their report and discussed the matter with Merlin. Sensei found the patterns drawing the map pieces together and was confident he’d located where the entrance to Nanda Parbat was in the Himalayas.

(Batman I #671) - Sensei, League ninjas and the Men of Death set fire to Nanda Parbat, with Sensei demanding the monks of Parbat give him the keys to the temple of Rama Kushna. The monks warned him that the Fountain of Life would bring only death to one who lacked purity of spirit, but Sensei said he intended to poison and pollute the fountain. Ra’s captured Robin and Damian, and told batman to choose which of his sons he would sacrifice so Ra’s could possess them. Batman refused to choose between them, and told Ra’s there was another way for him to restore himself. He offered to take Ra’s to Nanda Parbat and the Fountain of Life, and Ra’s accepted. They found Parbat ablaze, and Ra’s asked Batman if he ever saw someone that hated their enemy as much as Sensei hated Ra’s. Batman battled the Men of Death, and was surprised with how easily he overcame them. The monks of Parbat said Rama Kusha had strengthened his hand and weakened theirs. Batman and Ra’s made their way to the fountain of Life, which Ra’s had always believed was the prototype of the Lazarus Pits that had kept him alive over the centuries. Sensei was infuriated to see Ra’s yet lived, and asked what he needed to do to get rid of his wayward son. Ra’s asked him why he stood in his way, and Sensei responded that under Ra’s and Talia’s rule the League of Assassins had lost their way and their honor, and he needed to restore both to them.. Sensei rammed his staff into Ra’s chest , saying that if he just died Sensei might spare the Fountain. Batman and Sensei engaged in battle, with Sensei breaking Batman’s arm. Sensei was clearly the more skilled fighter, bragging that Batman had trained in combat for decades while he’d trained for centuries. Sensei threw his staff, driving it through Batman’s stomach. Batman knew he was outmatched, but because of his advanced age Sensei had limited stamina, and Batman kept the fight going long enough to get the advantage. They fell into the Fountain of Life and Sensei found himself burning, unable to stand the purity of the Fountain.

(Batman I #705 (fb), 707 (fb)) - Sasha Lo found Sensei’s corpse, and poured a vial of Lazarus Pit fluid down his throat, bringing him back to life. Sasha informed him that he was now only healed, but he now possessed true enlightenment. Sasha was the descendant of the villagers killed by Sensei in 1929, and knew he would seek out the Mask of the Beholder, and she would finally have the opportunity to destroy it.

(Batman I #704-707) - Sensei felt the Mask of the Beholder calling him from Gotham City. It had been hidden for decades by the Order of the Protectors, but psychic Luki Lo was homing in on its’ presence. Sensei took his Demon Tribe, a band of his assassins loyal to him, and came to Gotham City to kidnap Luki. His half-sister Peacock and Batman (Dick Grayson) interfered, so he attacked them, demanding they die for defying him. He was forced to flee with Luki when the fight went against his men. He beat Luki, but could not make the boy open his mind to him. He found a business card from Lucius Fox from the Wayne Foundation in his pocket. Sensei kidnapped Lucius, and revealed that he knew of Lucius’ association with the Jade Compass Society, a secret order of architects. Lucius’ father Jasper had been responsible for bringing the Mask to America. Lucius refused to cooperate until Sensei kidnapped his daughter and threatened to torture her. I-Ching, who was also trying to stop Sensei, and Batman were led to the abandoned Archives Library of Gotham, where Sensei found the Mask inside a statue of Thomas Wayne. He put it on, but found that it once again rejected him. Peacock revealed herself as Sasha Lo, and told Batman to allow the Mask to destroy him. Luki stepped in as the one truly worthy of it, and when Sensei went after him with a katana he split the mask in two. Sensei fled with one of the pieces, while Sasha left the other in Batman’s hands for safekeeping.