The form of Omnimon Zwart transformed into a berserker when someone infected it with a virus program. Any Digimon that crosses Omnimon Zwart Defeat’s path is viewed as a sinister foe, and any who get close will face a merciless onslaught.
The clash between the raging virus program and the remnant vaccine program inside its body has made it unstable, causing it to cycle between exhaustion and rampage while unable to heal its wounds. In one of the rare moments when the vaccine program pushed back and Omnimon Zwart Defeat regained its sense of self, it bound both weapons to limit the damage it could do.