Ferrus looked over the man laid apart before him. His iron eye dancing over interlinking with a dozen systems as it looks deeper into the nature of the metal and flesh before him. His subject was on a delicate balance of drugs to stay responsive but not die from shock as he was vivisected. His fleshcraft was a challenging art, as all good things are, leaving him to need to practice many times when working to refine the process. This man had been alone making him easy to take so that he could be fixed. The man had begged, not understanding that Ferrus was a savior not the monster that his primitive mind saw. Ferrus wove nerves into the secondary heart and looked over the changes. Many of the specialized organs in his own body wouldn't necessarily be needed in his craft but it was trying to puzzle out all the meanings and even with the tech stolen and developed the growth of organs made the iterations long. He started reassembling the man weaving in cybernetics alongside his fleshcraft. A century of labor gave the man a good chance, and Ferrus had honed his craft and the capacity of the eye to determine the material and properties of what he turned its gaze on had come in handy.
With a motion the scarabs had taken the man to a bod so he could decant and to ensure that his new modifications had taken well. "B-72? What's the status of the gene forges?" He had built a number of growth vats and if he latest couple subjects survived he would be able to make a significant leap forward in the processing of the local population; only a few thousand had been uplifted but if the new procedure worked then he could spend far less time on the growth of each. B-72 was part of a failed early batch while it was late enough to have anything survive the brain was the only part he had been able to keep alive at that time though he found that if he failed not much more than a brain was needed. The mechanical bodies provided the failed batches with a new semblance of life while not perfect it was free of pain and emotion and the lack of purpose that plagued these people in their lives before. The tomb had grown around him and Trazoekh as they worked on their projects. The strange beacon the Necrontyr was working on was nearing completion and Ferrus would be eager to learn of the arts of the Necrontyr from more than fractions of long ruined databases.
He turned back and rubbed his temples fingered pressing on the iron crown. The device reflects his emotions downwards and suppresses his ripples in thought space. A disruptive phenomenon he would need to eventually handle. Though the iron crown successfully disrupted its effects in his subjects. Trazoekh had disapproved of the local population but Ferrus had convinced the old Necrontyr that he could fix them without wasting the machine's limited resources. "Gene-Forge operational, producing moderate." The cold ascendant voice of one living with no strife or worry was calming reassuring Ferrus that his work was good. Ferrus turned his eye onto a newly produced organ cloned from one of his own samples. Seeing it he looked at the mucus it produced acidic with a reactive compound that would create a strong base in contact with a basic substance so that it could melt near anything. It was up to the standards of his own fleshcraft, a good sign.
The doors to his factory laboratory were thrown open by a warrior. The new human wearing heavy armor of Ferrus's design. Interesting, nothing important would be happening anytime soon. Trazoekh had turned the beacon on months ago but the systems of other tombs would take possibly centuries to activate and communication should happen long before any arrive. Another assault by the local humans? No he had personally destroyed several of their mobile cities after they had tried and rejected his words of perfection. They were foolish but it was only decades since and surely they wouldn't rise against him again when he destroyed them last time.
"Xeno ships landing in Area 6XC3. Unknown intentions." Ferrus sneered. Interlopers, what place did they have to disrupt his work. What right did they have to bother him? He turned himself to his networks and spheres spearing through systems of his own designs; the failures near the landing sight showed him heraldry and armor of blue and silver warrior, with columns of human soldiers behind them. They were speaking to the Lord's of a city crawler. The superhuman hearing of the failure's mechanical body tuned to the talk.
"...join you. However we are threatened by the mechanical monster that lives in the volcanos taking our people to turn into monsters and machines that slaughter us when we resist." That fool Ferrus had explained to the survivors of the cities he broke why he was doing this that it was for their own good, how could such simple ideas be lost already.
"Then it is so, we shall aid you in turn your people will take this world and thrive as a member of the imperium." Another armored warrior brought a flag of an eagle's head in a wreath as the two spoke on terms. He growled, he did not expect this to happen, it would delay him to put on a war and his soldiers would risk their perfect lives. He turned his attention to the cages in the back where subjects yet unworked resided. He frowned they would aid. The failures could keep processing them if he had to go and play war with the foreigners. The speaker turned and handed his helmet to a follower showing a human face. As the bearded man signed the deal Ferrus decided, his mind had processed all outcomes with the data available and he made the call.
[]Open War
He had his failure nearby fire on the head of the speaker, hopefully killing it and disrupting his enemy's for a long enough time to prepare for war.
[]Rightful Lord
Have the failure reveal itself and speak through it so that Ferrus can convince this Imperium that he was the rightful owner of this world and that they would need to negotiate with him.
[]Full Control
Have the failure speak, telling the interloper that this world was his and he would have nothing to do with the Imperium. Hopefully they backed up so he could prepare for full war.