[@Dinh AaronMk] 

Yeah you are right, reduce the weight to 300lbs - 350lbs, would this work?

These big lizards are not thriving, they are trophies to the Osai. Defeating one holds bragging rights, and taming one transcends an Osai and how they are perceived by other Osai.

On the other hand, I am not set on having them if you are against them even existing. 

And...

The stories and fear, are you talking about humans running from the mountains because the Naga preyed on their fears?