dragon slayers were created to battle against dragons in the dragons civil war
normal humans are useless against dragons, in order to kill a dragon you need a wizard that uses the dragon slayers magic with the ability to go into dragon force.
note Rogue and Sting's DF was incomplete and lacked power. you will find about those two in the later chapters
A given mission, mechanical assault, manufactured devotion.
Red eyes, an upside-down form. Even the twisted shape was made to be that way.
No matter how cruel the slaughter, worse than a demon's,
or how gentle the kindness, greater than an angel's,
a machine has neither will nor madness—only code, and a few bugs.
So why, then, does it feel so unbearably sad?