Young Jedi Knights : Jedi Under Siege Jedi Under Siege is the sixth book in the " Young Jedi Knights " series . Synopsis . The Jedi Praxeum is under attack from the Second Imperium . The Shadow Academy has arrived on the jungle moon of Yavin 4 along with legions of stormtroopers and Dark Jedi adepts , clouds of TIE Fighters and a fleet of modified warships . In response , the Jedi quickly prepare for war . Thus begins the battle ! This conflict will pit the Solo twins along with their friends and Luke Skywalker against the Dark Jedi Zekk and his superiors Brakiss and the Nightsister Tamith Kai . Who ever wins the battle will decide the fate of the entire galaxy . Summary . The final book in the Shadow Academy series explodes in the reader ' s hands with non - stop action and the final confrontation between good and evil . The story begins with an Imperial scout trooper disabling the shield generator of the Jedi Academy , leaving Yavin 4 open for a swift attack . Now fully trained Jedi with their own lightsabers , the young Jedi Knights quickly work together to stop the incoming threat . After Luke briefs all of his students for the battle to come , the twins disband to try and fix the generator and to call for help . While Jacen and Zekk ' s good friend Peckhum blast into space to send out a call for help , they are chased by TIE fighters flown by Zekk ' s former friends . After sending out a distress signal , Jacen and Peckhum dive back into the atmosphere of Yavin 4 , about to be obliterated by TIEs . But they are saved at the last second by a familiar face . . . Qorl , the imperial pilot . Meanwhile Lowie and Tenel Ka attack the landing platform that is unloading Dark Jedi into the jungles of Yavin 4 . Eventually Tenel Ka tracks down her nemesis , Tamith Kai , and engages her in a fierce lightsaber battle . Soon after the platform explodes , and while Lowie and Tenel Ka escape , Tamith Kai does not . Jaina , on a mission to repair the shield generator , is confronted by her former friend turned Dark Jedi Knight Zekk , who is assigned to destroy what ' s left of the Jedi . In the end , Zekk saves the Jedi by stopping them from returning to the Academy , which is destroyed by a bomb placed in the main audience chamber . Luke tries his best to turn his former student Brakiss back to the light side , just before they engage in an epic lightsaber duel . Luke is soon victorious , and Brakiss flees back to the Shadow Academy . But as the Jedi ' s re - enforcements arrive — in the form of Lando Calrissian and his GemDiver Station — the Emperor ' s guardsmen , who have been faking the Emperor ' s existence from the start of the series , reveal the face of the Emperor . The Emperor panics and engages the Shadow Academy ' s self - destruct . The Dark Jedi ' s base is instantly destroyed , with Brakiss on it . By the end of the story , all of the Jedi are battered , bruised , and barely alive . But the Dark Side has lost , Zekk has become the boy they once knew , and the Academy can be rebuilt . It is a day of victory . Behind the scenes . In the Polish release , the covers of " Darkest Knight " and " Jedi Under Siege " were switched . Brakiss says that no substance is immune to a lightsaber . " I , Jedi " by Michael A . Stackpole establishes that cortosis is immune to a lightsaber strike . Furthermore , the " Republic Commando " series by Karen Traviss describes this about " beskar " , which Brakiss specifically points out is not immune to a lightsaber strike .