Dorumon's Bio

A supposedly Beast type Digimon that bears an old interface on his forehead, and is assumed to be a former 'Prototype Digimon'. Part of a combat race of Digimon whose original characteristics have arisen more strongly, his high battle instincts cause him to bite at anything he sees, often prompting more battles to occur. It's said that his Digi-Core is carved with the battle data of a legendary "Dragon", and that he bears the possibility of evolving into more powerful Digimon as he grows up. His special attack is "Metal Cannon", which fires cannonballs from his mouth. By charging across the path and then stopping, he's able to preform "Dash Metal": an effective attack where he'll also fire out cannonballs with a greater amount of accumulated power. - Translated by Wildermon

The diamond-shaped "interface" on its forehead leads some to believe that it is some kind of prototype dating from before Digimon were discovered. - From DWDS