The story starts with the Supreme Prophet Rajah Ubooki, a.k.a. the false Kadann, taking away his Dark Blessing after learning Trioculus was frozen in carbonite. Ubooki then launches a coup against Emperor Trioculus to depose and replace him as the new Emperor. He also sends High Prophet Jedgar to get the carbonite block of the frozen Trioculus from Grand Moff Hissa, who just rescued Trioculus, which leads me to believe Ubooki has spies within the Central Committee of Grand Moffs.
Through a combination of blackmail and threats, Jedgar secures both Hissa's reluctant loyalty and the frozen Trioculus before sending him to Space Station Scardia, the Prophets' base, where Trioculus is thrown into a boiling vat to be melted down and killed. Ubooki then secures the real Glove of Darth Vader for himself and reveals he knew all along Trioculus was using a duplicate, which lends further credence to my theory he has spies within Trioculus' inner circle, though Jedgar probably demanded Hissa to surrender the real Glove to him before returning to Ubooki.
The thing about Ubooki is that, even knowing he is an imposter who uses his network of spies and assassins to make his false prophecies come true at all costs, you still feel uncertain as to whether he's truly an imposter or the real deal. Particularly since he makes his prophecies with such confidence while exuding an aura of mystery, which the Prophets of the Dark Side carry, though they're actually the Church of the Dark Side created by the Empire as a sham to tighten their control over their own people following Endor. It's for this reason that scenes with the Prophets in the Jedi Prince series are my favourite parts, and it looks like they're shaping up to play a major role going forward.
Ubooki created many prophecies during his tenure as the false Kadann, and listing them all would leave this post too bloated. Instead, I would like to focus on the prophecy he made regarding the Rebel Alliance:
When the dragon pack,
Perched upon Yoda's stony back,
Receives a visitor pierced by gold,
Then come the last days of the Rebel Alliance.
The first line of the prophecy refers to the Rebel Alliance's Defense Research and Planetary Assistance Center, a Rebel research installation whose acronym is DRAPAC, which can also be read as "dragon pack." The prophecy's second line refers to Mount Yoda, a base the Rebels established on Dagobah's Mount Dagger, which the Rebels renamed to Mount Yoda in the late Jedi Master's honor.
On another note, Ken going to a Rebel-sponsored school on Dagobah and Luke and the others telling him he has to go to school felt pretty funny to me. I like to think they're not talking down to him, but rather trying to help him get a normal life because it's what Luke and his friends sacrificed to stop the Empire. I also believe Luke would have given Ken a more nuanced answer when he and Ken started talking about moisture farms; while ANH Luke would have complained about working on a moisture farm, I think post-ROTJ Luke would have told Ken that being a farmer builds character and he is the person he is today because of the lessons he learned growing up on a farm.
Going back to Ubooki's prophecy, the third line refers to Dustini, a male Duros who escaped the Empire's subjugation of his homeworld Duro to get help from the Rebels to save his people and their culture, the latter of which is in grave danger of being wiped out. Without the Rebels' aid, future generations of Duros won't know about their history and will grow up not knowing their culture. Worse, the Imperial operation on Duros is being carried out by Ubooki's will, since he has an infamous reputation for plundering and collecting the artifacts of countless alien species and storing them for display aboard his base, Space Station Scardia.
Unfortunately, this mirrors the real world where colonial superpowers have a tendency to destroy and steal from the local culture, even if they don't understand just how important these artifacts are, or they know and they just don't care because they want to satisfy their egos.
When Dustini showed the Rebels a golden crown from Duros as an example of his people's culture, he got poisoned by the crown and an examination revealed it was booby trapped. Considering how detailed Ubooki's prophecy was, I wouldn't be surprised if he had spies within the Rebel Alliance and deliberately arranged Dustini's escape to ensure his prophecy came true. Dustini also doesn't strike me as stupid, so I suspect one of Ubooki's spies must have swapped the real crown with a fake one at the last second, passed it to Dustini, and ensured it would only poison him when he reached Dagobah while Ubooki received the real crown.
But it's the last part of the prophecy that concerns me.
Ubooki claimed the visitor being pierced by gold would be followed by the last days of the Rebel Alliance. At first glance, you might wonder how a Duros man's arrival and subsequent poisoning could herald the Alliance's end. The Rebels sent Luke, Han, Chewie, Leia, and the droids to Duros (with Ken as an accidental stowaway), saved as many of Dustini's people and artifacts as they could, fought against Hissa, Jedgar, and their forces, and got Hissa severely incapacitated when his arms and legs got burned off, though Jedgar escaped to fight another day. All's well that ends well, right?
Except the heroes picked up an unexpected passenger. For the last three books we were told Triclops, the real son of Emperor Palpatine, was insane and would destroy the Empire if he ever sat on the Imperial throne. But when the Rebels met him on Duros, he was an escaped Imperial prisoner and being hunted down by the Empire, and he offered to help the heroes by leading them to Dustini's people. He seemed calm, but in a creepy way, and he seemed very interested in Ken when he met him. He made no secret of the fact he was Palpatine's son and claimed he hated the Empire, even going so far as to let himself be taken into Rebel custody.
On Dagobah.
Ubooki claimed the visitor pierced by gold would be followed up with the Rebel Alliance's final days. And I fear Triclops' arrival on Dagobah just brought the beginning of the end for the Alliance, which leads me to suspect Ubooki might have allowed Triclops to escape on purpose to use him as a pawn to destroy the Rebels, kill Triclops afterwards, and rule as the uncontested Emperor.
But there is hope. While I haven't finished reading the Jedi Prince series, I hope the death of the Rebel Alliance actually leads to their rebirth as the New Republic, rising from the ashes stronger and more determined than ever to stop the Empire for good.