Sensei Yang Sensei Yang is a character who appears in the fifth season of " " in the episode " The Temple on Haunted Hill " . His grave makes a physical appearance in the set 70751 Temple of Airjitzu . He makes a physical appearance in his ghost form in the set 70595 Stealth Raider 2 . 0 . Background . Possesion . Sensei Yang was infamous for being a very strict teacher to his pupils . He was also the creator of " Airjitzu " , an fighting style in which a someone can temporarily fly , while using Spinjitzu . After his death , his ghost had been rumored to exist in his temple , and his students were never heard of again . It is also stated that anyone who does not escape his temple before sunrise will become a ghost In " The Temple on Haunted Hill " , the Ninja had visited his temple to receive the Scroll of Airjitzu . After finding out the Ninja ' s arrival , he planned make them hallucinate and see their worst fears . When the Ninja entered his dojo , he repeated his motto and attacked the Ninja with Dragon Swords . This was meant to scare Cole , as he is afraid of ghosts . While the Ninja try to escape , the temple starts to fill with water , Kai ' s fear . After Kai manages to open the door and escape , the Ninja encounter Zane ' s fear , Morro . The Ninja try to confront Morro , but he escapes to the attic , Jay ' s fear . After conquering all fears , Yang then hands them the Scroll of Airjitzu . However , he informs them that they only have five minutes left , reveals his past students as ghost , and tells the Ninja they will join his students . The Ninja then escape his temple , but Cole loses the Airjitzu scroll . After going back to get it , Cole returns after sunrise , becoming a ghost . While Cole and the others are depressed ; Yang starts maniacally laughing . Skybound / The Dark Island Trilogy . Sensei Yang makes a brief reappearance in the sixth season of Ninjago . His temple was taken by Nadakhan ' s Minfortune ' s Crew after Nadakhan lifted it into the air using his Djinn Blade . The Misfortune ' s Crew sprayed water inside his building , forcing him and his students out . Sensei Wu later experienced a vision of the future that included Yang , Dr . Julien , Acronix , Krux , Maya , and Ray . Day of the Departed . In Day of the Departed , Yang ' s temple was shown to remain floating despite Jay making a wish that undid most of the events of the previous season . On the holiday Day of the Departed , Yang took advantage of Cole ' s growing feelings of insecurity , the magical Yin - Yang Eclipse , and the inclusion of an exhibit at the Ninjago Museum of History to trick Cole into bringing him his old weapon , the Yin Blade . After Cole foolishly attacked him , Yang ' s magic brought back several defeated villains , whom he instructed to destroy the ninja so as to regain their places among the living . Yang then set out to use the Yin Blade , which was responsible for his ghostly state , that of his students , and the curse upon his monastery , to open a rift that would allow him to return to mortal form . Yang ' s pawns were defeated , with the exception of Morro who informed Wu and the other Ninja of what had transpired . Yang himself managed to open the Rift of Return only to be engaged by Cole , who eventually succeeded in destroying the Yin Blade and freeing Yang ' s students from his curse . After they passed through the rift and were returned to normal , Yang revealed that his previous use of the Yin Blade had stemmed from his fear that he would be forgotten when he died . Cole then helped him realize that he would be remembered due to his invention of Airjitzu , and attempted to take Yang through the Rift . However , the temple ' s curse forced one ghost to remain , and Yang chose to accept this fate and send Cole through the Rift before it closed . Cole became human again and Yang - now redeemed - remained as the resident ghost of the now noble temple , which the Ninja took up residence in . Hands of Time . Curiously , Sensei Yang did not appear during " The Attack " while the Vermillion were assaulting his temple .