So, I decided to up the ante with dragons and make them much more destructive by giving the aqua regia as the breath weapon.
The problem is that the dragon in this story is a sweet and cheeky kid, who prefers avoiding physical conflict. Even when it comes to trading blows, he'd rather avoid damaging the surrounding environment when using his breath weapon, partly because he lives in it.
Just like the rest of his kin, the dragon is roughly the size of a shire horse and can store several (2-3) liters of aqua regia at most.
The problem is that while aqua regia quickly loses its gold-dissolving property, it remains a potent acid for a while. On top of that, it also creates chlorine gas as a byproduct. The dragon was never a fan of trench warfare, especially when its smell is localized in his favorite clearing.
So, how could a dragon minimize collateral damage and avoid turning their beloved forest into the No Man's Land after fending off a pack of monster hunters with their breath weapon?