Berkas is giant dragon
Berkas hails from the Iron Dragon species that is native to the Underworld. Possessing a strong sense of pride, he always wanted to be independent of his species and create his own rule. However, the power structure of the Iron Dragon species has been firmly established for thousands of years, which consisted of the younger dragons being subordinates to the ancient and more powerful dragons, and Berkas soon concluded that it was impossible to gain power in the Underworld.