For a demonic beast to speak human language before reaching the sixth rank is not easy. It must receive help from either a sixth-rank Demon King or a Nascent Soul Stage cultivator to refine the "Transverse Bone" within its body.
Generally speaking, only the descendants of a sixth-rank Demon King are worthy of having a sixth-rank Demon King spend magical power and time to help refine their "Transverse Bone" before the sixth rank.
The fact that Jinpeng received help from a Demon King to refine its "Transverse Bone" while at Tier Five shows it must be a trusted confidant of a certain Demon King.
This made Cao Wenjin recall a legend about the Golden-winged Thunder Eagle tribe in the Broken Cloud Mountain Range, where a certain ancestor was the royal mount of a sixth-rank Demon King.
