A long time ago in a galaxy far far away, two robot races called the Abominor and Silentium, respectively, had a war and destroyed the galaxy. Thing is, this galaxy was also the home galaxy of the Yuuzhan-Vong. This resulted in the Yuuzhan-Vong adapting to use strictly organic tech and ultimately the Yuuzhan-Vong leaving their home galaxy.
They used to be force-sensitive, but over the countless years of traveling through the void, they became without the force and that makes them immune to most, but not all, force-based attacks.
Now the invasion was caused because the YV wanted a place to live, even though they had become a more militaristic species from the aforementioned countless years of traveling through intergalactic space.
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