This was the talent of an earth dragon.
There were a few different paths that their ancestors had taken, but few were able to properly thrive.
After all, the earth dragon bloodline was the thinnest of them all.
Other dragons came into being through various magical means. Those who evolved did so mystically and became beings far beyond their original stations.
Earth dragons were simply evolved lizards.
They could fly, but they didn't have wings like their peers. They were massive, but they were shaped like lizards with draconic features rather than true dragons.
Their species had always been discriminated against. They rarely gained access to resources, and since they didn't have a powerful ancestral bloodline in their heritage at all, they weren't able to harness the same talent that the other dragons had.