Badass...Utter fucking badass...
And the "villain" too, isn't just some kind one chapter filler enemy to be fought and defeated willy nilly, just to boost up the protagonists' rep.
It is an actual life-threatening ancient monstrosity with wisdom and might of ages.
To combat such ancient creature, the MC had to give his all, which in this instance was his ultimate spell...only to fall short due to the ancient dragon's substantial capabilities.
Now, it's the heroes' turn to weather the dragon's ferocious assaults.
Again...fucking badass.