After the Gulag virus, many people on Umbara had died. And it was just horrible. Many innocent souls had to suffer and... die. The Zero had to be a really bad guy. He had destroyed maybe the half of the galaxy. Not materially, but he killed the people. Umbaran books were all hidden somewhere, but Dominator often went back to Umbara to see, if he can find more books. One day, he had even created a book-collecting day, when people can take a day off and look for books. The day was funny and great, but they had only found ten books. And they were all the same books about Kani Nrahv, a mad historical Master of Umbara. He ruled the planet a few years before the super deadly Gulag Virus started to spread. He was one of the first Masters of Umbara and the most evil of them. Well, the Master before Dominator was evil too, though he wasn't so bad...
Thanks to Karen, he just remembered, what the Virus had done on Umbara, but it wasn't bad. After all, that was a thing, what made all, even present people suffer, though almost everyone was immune to it or was it completely gone? Though they shouldn't start to think, that everything is over now. At the time of Clone Wars, the Blue Shadow Virus almost spread again, but a few Jedi had interrupted the doctor's plans. Dominator didn't remember the doctor's name, but he knew, that he was an ally of the Separatist Confederacy, more know as the Confederacy of Independent Systems. The Blue Shadow Virus had spread in a few systems many years before the Clone Wars started, though it didn't cause so much trouble. But the whole meaning of what Dominator wanted to say, was, that every virus can start to spread again and can hit the mankind even more powerfully than it did at the first time.
Dominator did, like Karen said. He was ready to go to the Hyperspace. "I am ready!" He said and put his crystals away. They could easily disappear, so it was safer to hold them in his pockets. He didn't want to fly to Ilum again... Just to get a crystal because he had just lost it. It would've been a disappointment.