Short answers, pulled from the story.
American writer Dave Wolverton penned this 1994 science fiction novel as part of the Star Wars franchise. It continued a streak of New York Times Bestsellers that started with 1991's Heir to the Empire.
Two concussion missiles destroyed the bridge of the Iron Fist killing Zsinj and knocking out the ventral shields. Defeated, Zsinj's empire soon crumbles shortly thereafter after his ship was disabled by Hapan fleet ion cannons.
In 2014 following the acquisition of Lucasfilm by Disney all spin-off works up to that point became non-canon. This change excluded The Clone Wars from the reclassification process.
Han abducts Leia using the Gun of Command and flees with Chewbacca aboard his refitted Millennium Falcon toward Dathomir while Prince Isolder pursues them with his Hapan fleet. The Millennium Falcon was forced to land on Dathomir itself where it is captured by an Imperial garrison marooned there years ago.
Zsinj dictated a combination ultimatum and deal with Gethzerion promising to give them an Imperial shuttle if they gave him Solo to torture and execute. If they refused he would keep his nightcloak intact which reflected all solar emissions back into space to slowly freeze Dathomir killing all life on the planet.