Hundred-thousand-year soul beasts underwent transformation because they wanted to reach a higher stage, gain an endless lifespan, and ascend to a higher level of existence.
Once soul beasts reached a hundred thousand years, they had two paths to choose from.
One was to transform into humans and cultivate soul power anew. After taking human form, their cultivation speed would increase, making it very easy to reach maturity. Reaching maturity was equivalent to reaching the level of a human Titled Douluo, which would increase their chances of breaking through their limits.
The other was to endure their destined calamity. A hundred thousand years was a threshold for soul beasts. If they did not transform, they would most likely live another thousand years or so before their time ran out. Once the tribulation lightning arrived, surviving it meant rebirth; failing meant death.
After transforming into humans, soul beasts had no need to slaughter other soul beasts for soul rings. Instead, they would naturally produce a perfect soul ring once they reached the required level.
This was also why Xiao Wu believed Zhu Zhuqing was a hundred-thousand-year soul beast.
Tang San took a bite of radish cake, then exclaimed, "Were you out obtaining your third soul ring these past two days?"
Tang San truly could not figure out how Zhu Zhuqing had obtained her third soul ring. He knew perfectly well how powerful thousand-year soul beasts were. He had only succeeded in obtaining his own second soul ring with both his teacher and the dean helping him.
"Mm-hmm." Zhu Zhuqing nodded.
"That's impossible. Even if you were already a Two-Ring Soul Grandmaster, you couldn't have killed a thousand-year soul beast unless someone at the Soul Elder level or above helped you. Could it be-"
A bold guess surfaced in Tang San's mind. He