The Doombringer possessed superhuman strength as it was an enhanced human. Its thick, scaly hide was impenetrable to common arrows, but it was easily pierced by Wolverine's Adamantium claws and the Silver Samurai's tachon-field coated blade. Its brethren could also be hurt by the closure of an interdimensional portal while it was in mid passage. It had razor sharp claws and was covered sporadically by gleaming crystals, It did not speak, and it is unclear whether it was anything more than a rampaging beast.
Just prior to the first millennium, demonic elementals began imparting arcane knowledge to Clan Yashida's sages and mystics, convincing them to open a portal to Hell so they could summon the Doombringer (a demon who would end life on earth and allow them to become supreme rulers of Hell).