The Temple on Haunted Hill The Temple on Haunted Hill is the fourth episode in the fifth season , and the fourty - eighth episode overall of " " . Official Description . " The Ninja hear of another way to learn Airjitzu - from the ghost of Sensei Yang at his haunted temple - but there ' s a warning ; if you are trapped in it by sunrise , you will become a ghost , too . Meanwhile , doubting she ' s a Water Ninja , Nya quits her training to take Ronin to her Samurai X cave . . . but has a run in with Morro . " Plot . At Steep Wisdom , Sensei Wu continues to train Nya to be the Water Ninja but she messes with him and declares she ' s a Samurai . Misako then approaches and reveals that Ronin is in the shop . He explains that since the Ninja failed to get the scroll of Airjitzu from Morro , Kai already gave him their shares in the tea shop , so he told the Ninja of another way to learn Airjitzu ; going to Sensei Yang ' s Haunted Temple . The Ninja arrive , and hear from the tour guide that anyone left in the temple by dawn will become a ghost . When the tour bus leaves , the Ninja emerge from their hiding places and enter the temple , unknown of what lies ahead of them . Meanwhile , Morro examines the second clue of the staff , Bansha says they need more than Airjitzu , Soul Archer and Ghoultar implies they need to possess more vessels , and Morro suggest they need more vehicles . In the temple , the Ninja are searching for the scroll while Cole fears about transforming into a ghost if they don ' t leave the temple by morning . Jay reads a book about Sensei Yang and his strict methods of teaching . Later , the Ninja listen to a strange sound coming from the other side of the temple . Cole walks there and the other Ninja follow him , and found Sensei Yang ' s Dojo . Cole asks who knocked the door . Sensei Yang then says to the Ninja , " As iron sharpens iron , sensei sharpens students . " In that moment , several swords try to attack the Ninja while they escape . Zane suggest they head for the dumbwaiter but when they were inside , Sensei Yang appeared in front of the Ninja . When the group open the door to escape , they discover they were trapped in a ethereal inter - dimensional realm . In the tea farm , Ronin implies they need more money and not friends . Nya said they need to go to the Samurai X Cave , Ronin suggest they go to in the Bounty . In that moment , Nya offers a bag of money to Ronin if he can take her to the cave . Meanwhile , the Ninja try to think of a way to escape the temple . Jay sees a strange picture of water inside . When he knocked it , the room begin to fill of water . Yang returns and implies that " As Iron Sharpens Iron , Sensei Sharpens Student . " Kai , having a fear of water , tries to open the door , in which he did . Later , the Ninja understood that the Sensei Yang is trying to teaching them about their fear and to face them together . Meanwhile , Nya and Ronin travel over the desert with R . E . X . . Ronin tell Nya about he made a mad bet with Soul Archer and try to pay or his soul will go to the Cursed Realm . When they were near the cave , they discover they are not alone ; Morro and his group try to get one of Nya ' s Mech . In that moment , Nya activated her Samurai Mech to fight the ghost , in which she failed . Ronin save Nya from one of Soul Archer ' s arrows using an Aeroblade . Morro tried to summon more allies but Nya threw a bomb at the Armor , forcing Morro to get rid of it before it finally exploded . Ghoultar finally possessed the Samurai Mech , in which they will use to climb the Wailing Alps . Morro sent his forces to destroy Nya and Ronin . They try to escape but Morro and his group finally surrounded them . It miraculously began to rain , forcing the ghosts to hide . Morro implies that they can leave the two . Ronin implies that the rain was made from Nya , and implies she is the Water Ninja . Meanwhile , in the temple , the Ninja are ready to confront the tests of Sensei Yang like a team by tying themselves together . Kai asks Zane and Jay about their fear . Suddenly , Zane falls into panic to see Morro . Later , Kai understood that this is another test of Sensei Yang and they pursuit the false Morro . When he hides in the attic , Jay tells the group about his fears over attics . The Ninja climb the stairs and found the impostor . When they faced him , Sensei Yang appears to congratulate the Ninja for passing his tests and gives them the scroll of Airjitzu . In that moment , the transformation of ghost begin ; Sensei Yang warning the Ninja if they fail to leave the temple at the last chime , they will stay ghosts forever , forcing them to escape . When they ' re close to the door , Cole dropped the scroll and untied himself to retrieve it . When the Ninja are outside of the temple , they start to question where Cole is . When Cole finally get out of the temple , they are shocked ; Kai reply to Cole saying that he didn ' t get out the temple in time . Cole sadly say he is now a ghost . Sensei Yang then starts to laugh inside the temple .