Just now, the White Bone Puppet damaged the flesh surrounding it for quite some time, yet the large creature felt no pain whatsoever.
However, after the Tainted Blood in the Blood Sea corroded a small blood pit on the ground, the large creature, previously leisurely making its way back, suddenly let out a mournful cry. It seemed to be feeling the pain inside its body.
Although the White Bone Puppet was also wreaking havoc inside the creature's body, the large underwater being had not only a thick and tough exterior but a similarly resilient interior. Otherwise, when the parasitic worms deeply penetrated its flesh, it would have felt pain.
Yet when the Tainted Blood from the Blood Sea appeared inside the creature's body and corroded a blood pit within, continuing to eat away deeper, it did not only reach its blood vessels but also corroded its nerves. That's why it felt pain.