The Gods of Death are Angry
The Gods of Death rarely agree on something as they have vastly different opinions. They would basically go against each other just for the fun of it. They never agree on anything but one thing and that is too much work.
The sudden influx of souls in the underworld made all the Gods of Death crazy to the point that they were outraged by what their fellow gods did. The sudden outburst of monster hordes not only created numerous deaths for monster but also for people. The balance of life and death was basically unable to be predicted.
The death tolls are still rising by the minute which is why they have given permission for Adrian to act. The Champion of the Twin Gods is not just a judge for the dead, but they can also be a judge for the living. If life and death hang in a peculiar imbalance, the Champion of the Twin Gods must execute full authority.