With the help of more than a dozen Dacheng Quasi-Immortals of Yaohua Palace, Zhu Wuwan's enslavement of more than 200 Integration Heavenly Pillars of Yaohua Palace was quite smooth.
It might be a bit of an exaggeration to say that he was invincible, but at the very least, he was unstoppable. The Integration Heavenly Pillars of Yaohua Palace were easily taken down by Zhu Wuyang and became his slaves.
Compared to enslaving a Mahayana Quasi-Immortal, these Integration Heavenly Pillars were much easier. Many times, Zhu Wuwan enslaved many at the same time. He didn't even need to estimate the other party's situation and directly enslaved them forcefully. Basically, he wouldn't fail.
Even if there was a mistake, the soul-chasing and life-taking characteristics would follow closely behind. Coupled with the heavy nerves, the other party would fall into a coma. Zhu Wuyang could then properly deal with it and enslave it.