The stone is a powerful crystal that transforms humans into dragons in 1 day, so the Dragon that lives in the caves protects it. The dragon is yellow with a small horn and a long neck and long tail, it usually lives in caves and does not like to be exposed to society. There is a way to convert this, but you need to look for some other dragon that has crystal knowledge to convert. Even if you drop the stone, the transformation is still happening unless you know how to stop it.