A real dragon is the most legendary creature, and its existence is known to be the noblest. Its capabilities surpass normal imagination.
This is apparent just from the object before everyone. Even though it was merely one scale that has endured god knows how many years, it still retains an unimaginable amount of power and makes everyone have trouble breathing. This alone was enough to prove the powerfulness of a real dragon.
Other than insane battling abilities, everything on the dragon is a treasure in itself. Its blood is rarer than any spiritual medicine, its bones extremely sturdy, and its talons are indestructible.
As for the scale, it was, of course, a valuable treasure that is extremely special and hard to find. Even though there was only one of them, it still remains as an out of the world prize. It is a great material to use to forge weapons, as it contains the prowess of a dragon and can bring all enemies into a state of shock.