Here's an interesting little article I found while looking through the now defunct WOTC material. It's geared toward the NJO as an RPG setting, but discusses the beginning of the series. It somewhat summarizes Vector Prime and the first chapter of Dark Tide I: Onslaught, e.g. it assumes you know about the Yuuzhan Vong a bit. It's useful because it really does a good job of summarizing the state of things at the start of the series.
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In case you're not familiar with The New Jedi Order, game designer JD Wiker tells you what it's all about!
The New Jedi Order has a lot of layers, a lot of different levels. At its base level, it's the story of the Yuuzhan Vong invasion force taking the galaxy away from the New Republic. And easily, at that. They have a seemingly limitless supply of ships and personnel, and the least of their warriors is the equal to two average New Republic troopers. They take slaves and sacrifice captives. They're absolutely vicious -- and have no interest in diplomacy with the "infidels" they perceive the New Republic to be. And they're all immune to the Force, which renders the Jedi considerably less effective against them than they would be against, say, stormtroopers.
But underneath that is the story of a fresh, young, political body going through its growing pains. The New Republic government is ready to get on with the business of politics, rather than the struggle of defeating a common enemy like they had with the Empire. They'd like the warriors who won them the galaxy to quietly disappear and let the politicians fight among themselves, with words. They don't want to believe at first that an invasion force from beyond the galaxy is attacking them, because they think it's some kind of political play on the part of the Jedi. An analogy would be if the United States government in 1941 hadn't believed that Hawaii had been attacked because they thought the reports of Pearl Harbor were a power play on the part of the U.S. Navy to get more funding. The New Republic quickly comes around when a horde of refugees begin showing up at their doors, though. So on that level, it's a drama of political maneuvering.
Then there's the related issue of Luke Skywalker, now a Jedi Master, trying to figure out how the Jedi should fit into the galaxy, into a New Republic that they're technically not a part of. It doesn't help that even while Luke is considering whether the Jedi should be peacemakers or policy enforcers, some Jedi have taken it upon themselves to patrol the Outer Rim to keep it safe from pirates and free from smugglers -- never mind that some of those pirates and smugglers were the very people who helped the Rebel Alliance defeat the Empire a few decades previous. And, in a kind of microcosm, you see this same struggle reflected in the children of Han Solo and Leia Organa Solo. Anakin Solo believes the Jedi need to have a "hands-on" approach in the galaxy, much as the Jedi "radicals" do. Jacen, his older brother, feels that the Jedi need to distance themselves from galactic events while they rediscover what being a Jedi really means -- which somewhat echoes Luke's own philosophy. And Jacen's twin sister, Jaina, is constantly trying to be the peacemaker -- taking, after a fashion, the role of her teacher and aunt, Mara Jade Skywalker. What's really needed is a new paradigm among the Jedi, and you get to see that start to form throughout the novels.
Another level lies in the internal politics of the Yuuzhan Vong. Their belief that the gods have granted them this new galaxy after millennia in empty space drives them to fanatical aggression. They take world after world and slaughter entire populations because they believe the galaxy already belongs to them and that the infidels in the galaxy can be enslaved, sacrificed, or simply wiped out from orbit. "But negotiation is out of the question, unless it involves your unequivocal surrender." Yikes! What a great environment to play in!
Perhaps the most important level, though, is the heroic journey -- the monomyth of the hero's progression from relative obscurity to saving the world (or the galaxy, in this case). Luke Skywalker went through that journey in the original Star Wars trilogy. Now, though, it's someone else's turn -- and I won't tell you whose. At any rate, the monomyth always makes a good story -- well, pretty much by definition -- and watching it play out is half the fun of reading these books. And, we hope, it will be most of the fun of playing RPG campaigns set in The New Jedi Order Era.