First-Rank Heavenly Demon Beasts are at the peak of divine beast strength and usually require tens of thousands of elites from all sides to possibly slay them.
Most of the time, a First-Rank Heavenly Demon Beast can wreak havoc after bursting through a rift before retreating unscathed.
Unless it encounters the sword cultivators and the sword array of the Nine Mysteries City entangling it.
As for the Supreme First-Class Heavenly Demon Beast, there are but a few forces in the Arena of Strife that can withstand them.
Nine Mysteries City, Wanling Palace.
Besides these two, there are no other forces with a record of actually assembling an army strong enough to fend off a Supreme First-Class Heavenly Demon Beast; the rest have no such battle achievements.
Whenever there is a hint of a Supreme First-Class Heavenly Demon Beast approaching, everyone's first reaction is to flee.
Of course, the only person who can hunt a Supreme First-Class Heavenly Demon Beast alone, is Han Muye.