Dead Suns #3The story arc concludes before the end of 2018.
I skipped the middle adventures in the AP, mostly due to the fact that they unnecessarily dragged ou the investigation - although it's possible the investigation could continue after this conclusion.
At the end of the last adventure, both the bad guys and the PCs had discovered information on the Gate of the Twelve Suns, and ancient megastructure thought to contain a superweapon called the Stellar Degenerator which can drain the life from stars.
As the Sith Emperor Callidus led his fleet into the unknown regions to try to claim the superweapon for himself, the Jedi Council assembled their own fleet to stop them. With Taryn as the diplomatic point man in the breakaway Corellian system, she had to persuade their government to join the Republic in this vital mission, despite objections from some on Corellia that the Jedi Council would just use this as an excuse to reassert their own jurisdiction over Corellia.
A major space battle ensued as a backdrop, during which the PCs managed to fend off Sith fighters an infiltrate a planet orbiting one of the twelve dwarf stars which was thought to house the control center for the Gate. Down on the planet, they were ambushed by Sith forces but fought their way through them. They then tried to use the disguise trick that Han used on Endor, but the Sith forces inside the base saw through the deception, and the PCs ended up being taken prisoner once they were inside.
However, Ayfour avoided being spotted, and he snuck in and stealthily managed to free the PCs from their binders while a Sith scientist was monologuing about opening the Gate and gaining control over the superweapon which would allow them to rule the galaxy. Taryn killed him like Kylo Ren killed Snoke, then pulled her confiscated lightsaber to her hands and another fight commenced, which was successful in short order. It concluded with Neeko finishing off a Sith soldier who had been referring to him as a "swamp rat". Neeko had warned the guy he would pay for that, and he did when Neeko coup de grāce'd him with a knife to the throat. He basically just murdered the poor guy.
Afterwards, the PCs could not figure out how to use the ancient technology to close the Gate again, so they decided to just blow up the whole control complex before the Stellar Degenerator was completely free of the Gate. This casued the Gate to collapse in on itself, destroying the Stellar Degenerator in the process. So Emperor Callidus was unable to get his hands on the superweapon, but he did escape and flee back to Sith space.
There are still unanswered questions about the mysterious ancient race and whether they might have left more technology behind in the unknown regions, which could provide the source for further investigations.