Onimi was in the new Flagship of the Vong after he had successfully used his force powers to influence all the commanders to make him the New Supreme Overlord. And his first plan was to save Warmaster Tsavong Lah who was left on the planet Ulum to fight the enemy.
He wanted to save Warmaster because there was nobody who was more capable than him to be Warmaster and trying to find another Warmaster would be too much work plus having a loyal powerful Warmaster will help with his plans in the long run.
Onimi was reorganizing the fleet with his main fleet having 80k ships while other fleets will have around 20k ships each. But for this assault on Ulum, he will bring all fleets to take the planet and save Warmaster Tsavong. The total number of ships will number around 200k.
As the final steps were taken to prepare for the invasion of Ulum John had returned to Coruscant with Supreme Overlord Shimrra after the victory at Ulum. And once he returned the citizens were celebrating in the streets as John made his way to the Palace.
John did this so that he can reassure the citizens that Vong was not a threat and with the capture of their Supreme Overlord the citizens were defiantly reassured that they will win this war. But as John was on the transport cruising through the street he couldn't help but feel that the force was trying to tell him something and he could feel that a new threat has emerged somewhere in the Galaxy. John knew that the force was obviously trying to warn him about something and he wasn't about to ignore this warning so once he returns to the palace he will discuss this with Master Yoda who he was sure got the same feeling.
As John's transport approached the front of the Palace Shimrra was taken to a secure cell where he will be watched over every minute of the day. After entering the Palace John had seen Master Yoda coming up to him.
Master Yoda was very healthy since John had made him look younger which gave him the speed he once had 300 years ago and he was happy since he could see the peace and prosperity of the Galaxy and continue to train Padawans and see the Galaxy change. He was very thankful to John for what he had done.
"Master Yoda how are you doing" Asked John who was happy to see him since he was just about to meet him
"I'm doing fine Lord John but I come to tell you about a message that I have received from the Force one I'm sure that you have received also," Said Yoda. Yoda called John Lord John because that's what John asked him to call him instead of your Majesty or Emperor John.
"Yes I have received the message as I was just coming to find you so that we can talk about it," said John He then led Yoda to his office where they can talk secretly. After entering the office Yoda and John had sat down and begin discussing what they should do.
John had recalled his time in his previous world and knew that there were only two people amongst the Vong who could wield Force Powers and it was a Male named Onimi and another Mysterious Vong who he didn't know of but he thought that the most likely person that the Force was talking about was Onimi since he was the true power behind the Vong.
For the Force to Warn John about him must mean that something big was about to happen so he discussed with Yoda what he knew but he did not reveal anything about his previous world and only told him that he received a Vision of the two force wielding Vong.
After thinking and discussing for a while Yoda and John had both come to the conclusion that another attack on Ulum was going to happen since the Vong Warmaster was there. They learned about him being the Warmaster after interrogating him and making him confess though torture wasn't needed that much since the Warmster was already angry that he was abandoned on the planet and left to be taken, prisoner so he was very talkative with the enemies since he knew he couldn't win and he was also very intrigued since the enemy was very strong and the report that they had received pre-invasion indicated that the enemy was still recovering after the unification of the Galaxy and was weak but it seemed that was not the case since the enemy was very strong had numbers and advanced technology.
Although the Vong despised Technology Tsahvong could see the advantages of Mechanical Technology and wondered that if they weren't invaded by the two droid civilizations would they also be using mechanical technology. As he was imprisoned he thought about these things.
After he goes to The Vong Galaxy I was planning on having him go to a fantasy world and Learn Magic let me know in the comments if he should and if I do that he won't be having his entire army at his call since I am going to make him stuck there with a couple of subordinates