Despite being new to the underworld of crime on Metru-Nui, he learned quickly, finding that his carefree personality, leadership qualities, and intense bursts of violence made him an excellent crime boss.
He quickly led the previous Black Suns, renamed 'The Knights,' into the forefront of crime, operating the largest smuggling, 'insurance,' and counterfeiting group on the island. The Vahki enforcers had very little effect on inhibiting them, as with the BARON's knowledge of robotics, and having worked on the Vahki himself, knew exactly how to shut them down and take them out.
Eventually, his gang encompassed all of Metru Nui . One group of grunts tried to create an opposing gang out of some mutinous members of The Knights, headed by a rival of the BARON, jokingly called the DUKE, who was a major agent in the Black Sun and was against the BARON ever since his takeover.
As soon as he heard the news of the double-cross, the BARON personally collected a group of his chief Knights to take a drastic attack on the DUKE's forces, wiping them out in days. The BARON saved the DUKE for last, saying to him: "There's only room for three in this gang; Me, Myself, and those who bow before me." Then he kicked him off the edge of a cliff.
Several years later, he began the expansion of his 'kingdom.' He first traveled to the Northern Continent, creating several bases there, each headed by one of the same Matoran he had selected to take out the DUKE's forces, each incredibly loyal to the BARON, mostly because he had all of them 'upgraded' to highly advanced exoskeleton-based cyborgs, with internal programming to always be loyal to the BARON. This was done mostly from the BARON's paranoia of another revolution, which, of course, never happened.
He then expanded to the Southern Continent and a number of smaller islands, including Stelt, Polaiz, and, after the commotion with the rise of Korrothis, Koromar, AKA the Isle of Thorns. On Koromar, the BARON made himself a personal headquarters on the island, where he could invent, build, and conduct his army in peace.
After some time of living on the Isle, the BARON befriended and recruited a Av-Matoran posed as a Ce-Matoran named Bayzon after a nasty run-in with some Makuta. The BARON decided that, should he be unable to, Bayzon would lead the Knights in the future.
Soon after recruiting Bayzon, the BARON found that his friend who he had thought had died in the Achieves Fire, Turaga Phirset, was actually alive. They were reunited, but it was bittersweet. Kirset was sent to monitor the BARON by the Order of Mata Nui to see if this 'new threat' was enough to have action sent. Now that the BARON knew of them, the Order stepped up their efforts to kill him.
Another Order member, this time a Toa, was sent to kill the BARON. He almost succeeded, if it weren't for Bayzon. The Order continued to send assassins, desperate to not let their presence known by anyone.
Great story. You made me remember: I'd been cooking up a little extra plot for the IOT. There's a new chapter now called 'Tears of the Waterlord'. I'm 'really' sorry about the gap. I kinda lost faith in the group, needed time to think about it.