Kyoshiro's body modification had not been put to much use in his entire time being with the Shogunate. Sure, they helped him create his lab but beyond that his business was sinking. He was determined now that he was not a blade to travel around the world to gather new test subjects and perfect his gene splicing in private. However, as a gift to give the Shogunate in return for all they did for him he had decided to begin an experiment. He had already gathered the DNA of the test subjects, though he didn't get all of the ones he wanted and his time was running out. With the eggs and his sperm in storage and the kaironokumas DNA in a freezer, he would begin his process.
Kyoshiro made hand seals and then began to mold flesh in a corner of his room. It took a lot out of him but to perfect this experiment he created a total of ten hyper growth cocoons. Afterwards he would then take the eggs and sperm, injecting some into all ten of the cocoons. He would then take the kaironokuma DNA and inject it into five of the cocoons after two weeks of development. He would look at the kurogane spine he had taken from the Kurogane test subject and the kaironokuma's hands in their freezer, ready to apply them if necessary. However, it was now a waiting game before the ten would be at a readable stage.