This caused a new rule to be created, that if a holy beast were killed a higher holy beast would hunt the executioner or kill the whole organization or family of that person, which reminded the petty humans that the sacred beasts were not beings easy to get bullied!
Unfortunately, the organization of the underworld also circumvented these rules, but it did not kill the holy beasts, as this was practically a death sentence, but they captured and tried to domesticate these holy beasts. Of course, if discovered by the holy beasts that would be the end of the underworld organization, but few people knew it.
The great sects knew these practices, but closed their eyes on them, as long as they were not the kind of sacred beasts that protect their territories, they did not care much about the situation. After all, the holy beasts were strong enough to wipe out all humans, so why do they need the protection of humans?