Normal?

Instead of being a mysterious martial will that could attack the psyche of an opponent, the wyvern's bloodline was entirely focused on strengthening their own bodies. This was without a doubt the simplest by far! In fact, training them was even simpler! 

Every day for over a century, Dyon forced the wyverns to bow beneath his Presence, forcefully agitating their blood again and again. He showed no mercy, even stamping his feet upon their heads and grinding them into the ground. 

This situation went on for decades. The humiliation was etched into their souls so fiercely that some of them even directly committed suicide. 

It was a cruel thing indeed, but Dyon continued. Dyon goaded them with words, each sentence seemingly piercing directly into their hearts. 

Finally, on one faithful day, one of them finally snapped. 

A mighty roar escaped its lips as land for hundreds of kilometers was completely leveled.