Prophets of the Dark Side ( book ) Prophets of the Dark Side ( 1993 ) is the sixth and final book of the " Jedi Prince " series by Paul and Hollace Davids . It is set in the Rebellion era and written for an audience of young readers . Publisher ' s summary . A JEDI PRINCE . A DEVASTATING BETRAYAL . AND THE DESTRUCTION OF THE LOST CITY ? " The battle against the evil Empire rages on as heroic men , women , and aliens of the Rebel Alliance continue their struggle to end the era of darkness . But by rescuing an Imperial prisoner , have the Rebels brought disaster upon themselves ? " " While on a perilous quest in the mushroom forest of Arzid , Luke and Ken are captured by Kadann , Supreme Imperial Prophet . Having tempted the young Jedi Prince into revealing the location of the Lost City of the Jedi , the Supreme Prophet plans to steal the ancient knowledge of the Jedi Knights . Now Kadann will rule over a new tyrannical empire , as foretold by the … " Prophets of the Dark Side . Plot summary . As Trioculus lay dying he made Grand Moff Hissa promise that he would make Luke Skywalker and the rest of the Rebels pay for killing him . Meanwhile , at the Rebel base , they realize that Triclops , while sleepwalking , goes through files at the base and transmits them , through an implant on his tooth , to Imperial probe droids which are evading defenses . Leia proposes that a defense probe be built from plans found at the Lost City of the Jedi . These plans happen to be from Ken ' s homework assignments , prompting him and Luke to return to the city . While there , Ken ' s caretaker Dee - Jay and the other droids tell them about a decoy transport to the city that now leads to an underground sea of lava and also warn them of a prophecy by Supreme Prophet Kadann which says While they return to the Rebel base on Yavin , Zorba the Hutt has a meeting with the Prophets of the Dark Side in their space station Scardia . He tells of the grand moffs betrayals and plans of making Trioculus leader once again . When the Moffship is captured , they are put to trial , and surprised to see Zorba as the main witness . All of the moffs are sentenced to certain death , with Hissa ' s being the cruelest , as the loyalest supporter of Trioculus . Back on Yavin 4 , Luke decides to give Triclops false information about the decoy transporter . In order to stop the information leak altogether , Luke , Ken , and Chewbacca went to the planet Arzid to find a mushroom to deactivate the implant . While there they are captured by Imperial stormtroopers and brought to the Prophets . Kadann , using the false information from Triclops , sends Hissa to his death in the decoy transport and threatens that he will send Luke if Ken doesn ' t betray the location of the real transport . He also promises Ken that he will reveal who his father was . With that motivation , Ken betrays the city and is brought with the Prophets to it . There Kadann reveals that Ken ' s father is Triclops meaning his grandfather was the Emperor . Not wanting to believe them and crying , Ken is told that he will be bred to be the new Emperor and will know the Dark Side of the Force . Meanwhile , Luke , finally able to get free of his guards and rescued by Han and the others , is able to sneak into the city through a steam vent . He rescues Ken , but not before the city is shut down by the Imperials and an earthquake destroys the main computer . Although Luke and Ken are able to reach the surface , Kadann and the other prophets are trapped in the city . Ken is able to come to terms with his parentage , but is unable to speak to his father about it , as Triclops manages to escape and evade capture in the forests of Yavin . The story ends with Leia , preparing for her wedding and seeing a vision of Han with their two children , wondering if they are twins .