Myself I like some of the rarely seen wild beast dialogues - I see some of them more often with mods - however there are some that I've never seen and make me wonder what they're used for, if they even are used.
We are besieged by a terrifying monster from the harshest wilderness. - does it relate to beasts from savage biomes?
A savage beast from the thick of the wilds hunts us at will. - probably the same as above.
Creatures grow mighty out in the wildest regions. - again, same as above probably.
At times, creeping things slither out from below ground. - I've seen this one exactly once - it was about a Nuckelavee from underground. Maybe third cavern layer+evil token?
Demons from the underworld must not be permitted to walk freely upon the land. - pretty obvious but I've never seen it, since demons don't walk the surface anymore.
At the end of the world dwell the fiercest beasts of legend. - this one's interesting...seems like it should be used for very far-away creatures or perhaps glacier ones.
A force of evil has arisen in the world. - I've seen this one used in relation to a LARGE_PREDATOR type creature holding some kind of noble position. Though, I once got a quest with this text to kill a prisoner who was of a race that had the same token.
The forces of darkness have descended upon us. - sounds like a siege thing tbh. But it's lumped with all of the other beast texts.
A ferocious unnatural beast has become the bane of our people. - I've seen it used for predatory creatures without the NATURAL token.
Something truly horrifying has vomited itself forth from the depths of the world.
A great monster from the underground is said to have emerged from the darkness.
A vile beast from the caverns now walks the land.
A lurking pest has come up from the underground.
Terrible monstrosities live deep under the ground.
A terror most foul from the evil depths nigh the underworld plagues us.
A vile monster from the bowels of the earth has been preying on our people.
A beast from underground has been assailing us. - all of these seem to be for underground creatures and/or forgotten beasts. I've only seen the "vile monster from the belows of the earth" one though, in relation to a troll.