The transformation into half-beasts happened due to the beast bloodline overtaking the human one, those who had it well integrated looked more like humans due to being able to avoid that overtaking.
In Shirk's case, the beast bloodline had the absolute advantage; Shirk was more lizard than human, everyone could tell it by his looks.
However, the bloodline alone couldn't transform a human enough to turn it like someone of the species of those invaders, people like Shirk are extremely similar, but in the end, they were still half-beasts.
The first step Yale needed to do was modifying Shirk's body to turn it even more similar to the invaders. Yale started by Shirk's skin; although it was already sturdy, compared with the details in the book, it wasn't enough.
Yale changed to his adult form to improve his mobility, giving blood to drink wasn't a problem with his kid appearance, but for other experiments it was bothersome.
Shirk wasn't surprised by the change; he knew that there were skills to appear older and it wasn't strange that genius kids used it; as Yale was the most outstanding genius Shirk had seen, the fact Yale could use one of those skills wasn't something that could surprise Shirk.
Yale gave a drug to sleep to Shirk before starting his testing because he didn't trust Shirk enough and he would use different methods in different parts of the skin and use Time Healing to revert all the failures.
Yale didn't have enough confidence in his level of Time Healing to reverse huge bloodline changes as his knowledge of bloodlines was still lacking, but as long it was just the body, Yale was fully confident in being able to undo any mistake as long Shirk was alive.
In fact, without the assistance from the system, Appraisal and Time Healing, that experiment was doomed to fail because every half-beast would need different methods and if the experiment failed with one subject, the next ones would turn more complicated. The best method was to test always with the same individual, but without Time Healing it was impossible, other healings wouldn't heal those changes as they weren't true injuries.
For the next month, Yale didn't get out of that room, and Shirk spent almost all the time sleeping. Yale was in a weird state of mind; he was only focused on the research by experimenting with Shirk's body.
That was a deep obsession with the research, anyone who had seen him would have been scared, but the effectiveness was undoubted because after that month Shirk's skin was tougher than most armors, it would be difficult to harm him with a strength inferior to the Apprentice Rank even if Shirk didn't defend. However, even being that tough, the skin didn't harm Shirk's flexibility nor his movement speed.
Shirk was extremely pleased with the toughness of his new skin, although his bloodline and power level remained the same, his battle prowess changed completely, and that was with only the skin improved.
The skin was the easiest to improve and doing that was already a feat, but Yale wanted to do the research until the end. That wasn't because he wanted to turn Shirk stronger, that was just a good side effect for Shirk, Yale was just too immersed in the research.
Yale only spent time with Aiwai and Wyba when he was blocked or when they went to visit him at the experiment room where he spent almost all of his time; Sebe also went to see Yale and Shirk sometimes, being Shirk's boss he was deeply interested in the result experiments.
Another five months passed while Yale continued with that routine.
In those months, Wyba reached the 7-star Novice providing a good increase in the capacity of Bloodline Force as that also improved Yale's bloodline. Although Yale hadn't trained properly due to being focused in the research almost all the time, Dexterity reached the max thanks to the experiment itself, and his other stats had reached the max thanks to Aiwai's food. Moreover, the continuous use of Time Healing had also improved his Origin Points to the max, so he managed to reach the 8-star Novice. That speed was far slower than his usual speed training near Aiwai, but that was better than nothing.
The most surprising in those months was that Aiwai decided to reveal her healing skills to Sebe and managed to obtain a job as a healer in the palace.
The royal family was specialized in Light Healing while Aiwai was specialized in Water Healing, so they were happy to have a new healer with a different healing type to treat those who return injured. Moreover, although it was possible to learn healing spells with the royal family's bloodline, not everyone in the royal family had managed to learn healing spells as it required effort and even less of them wanted to act as healers, so they treated every healer very well.
The royal family was the best employer for healers, they valued healers a lot, but they didn't have a lack of them to go crazy to obtain healers like other powers in the kingdom. Furthermore, the rewards the royal family offered were extremely enticing; although Aiwai wasn't poor, those resources offered by the royal family were a must for her future training.
Those resources were the main reason for Aiwai deciding to work for the royal family as a healer; she didn't want to waste a chance to become stronger in the future.
Of course, she had told it to Yale and Wyba before showing her healing spell to Sebe and starting to work as a healer, but they didn't have anything against it. Wyba just didn't understand it well, so she didn't care, but Yale knew that with their relationship with Sebe and their fake background, Aiwai wouldn't have any problems.
Yale and Wyba had some improvements in their battle prowess due to their increase in power level, but in those months the one who had the greatest changes in battle prowess was Shirk.
His looks were almost the same as before starting the experiments, but internally he was completely different. Shirk's current body was the same as one of the species that invaded the continent in the past; he had turned into a Lizardman.
A Lizardman and a half-beast with lizard bloodline of extremely bad quality were almost the same externally, but the Lizardman's power didn't have anything to envy half-beasts with bloodlines of the quality of Aiwai or Sebe, although they were still inferior to a half-beast with a divine bloodline.
At the same moment Shirk stopped being a half-beast, his bloodline restriction was lifted; although he also wouldn't have any help from his bloodline to advance like half-beasts, he didn't have any limitation, so Shirk's potential changed completely.
For people with good bloodlines that just relied on the bloodline to advance, losing the help of the bloodline was like crippling them, but for a hard-worker with a bad bloodline, getting rid of the restrictions was the only important thing as the help of the bloodline wasn't helpful at all.
The day the experiment finished, Shirk was extremely happy, but also extremely grateful to Yale, his whole future changes thanks to Yale. Although Shirk worked for Sebe and was loyal to him because he gave him a chance to change his future, Yale was the one who really changed his future completely, so although he didn't have any obligation, he was also absolutely loyal to Yale.
That reaction was normal for any half-beast with a bad bloodline who experimented the same changes as Shirk, the gratefulness for being able to get rid of such a cursed destiny was something it was impossible to repay.
Yale had only done the research for his own reasons and didn't plan to do it anymore as it consumed a lot of time. Moreover, his knowledge about bloodlines already deepened a lot.
"I finally understand it."
Shirk was shocked by Yale's sudden words, but he didn't want to interrupt him as Yale seemed to be in some kind of enlightenment.
"The true difference between divine bloodlines and normal bloodlines are just the fact that all divine bloodlines have the power of the laws inside them making it easier for those who had a divine bloodline to understand the laws. A method created based on the experiments of invaders to make the future generations more powerful, but this method is incredibly better than the one used by the invaders. The divine beast bloodlines and the bloodlines of the noble clans in the Revgen Empire, all of them are divine bloodlines with the power of the laws. Divine beasts are beasts with the capability of understanding the laws and the human bloodlines were created by humans who controlled laws."
Yale wasn't conscious that he was shouting it all, controlling oneself in the midst of enlightenment was difficult.