#asarakam

Oh yes! Please note.

(SPOILERS) Okie dokie, here we go:

Firstly, Priscilla isn't deemed the strongest monster "in the world." By the characters, she is assumed to be the strongest creature in the warriors' history. Notably stronger than an Abyssal One, which is unheard of.

Those who deem Priscilla the strongest are unaware of Teresa's existence.

If they deem her the strongest creature in the world, they are also obviously unaware of the Dragonkin/Asarakam.

Regarding the Dragonkin: Awakened Beings are just as strong as the Asarakam.

It obviously has nothing to do with being a "full monster" because technically Awakened Beings are also "full monsters" devoid of humanity. And if we used that logic, yoma should be much more powerful than Claymores (half-yoma half-human) and perhaps on par with Awakened Beings (awakened half-yoma half-human), since yoma are the fusion of both Asarakam forms plus a human form.

Also, if Awakened Beings weren't equal to the Dragon Descendants, they wouldn't take half-human half-yoma warriors, on the brink of awakening, out to the mainland to engage in battle.

To quote Miria from Chapter 79, in regard to "a weapon that allows a human to turn into a monster" a.k.a Awakened Beings: 

"But because these weapons are too powerful, they often wiped out their own army... the research has been left on a small island away from the greater land."

And from Chapter 80:

"Thanks to those Awakeneds' battle performance, that marked the birth of a new kind of monster, capable of battling the dragons' descendants on equal terms."