The situation in the Abyss has changed drastically recently. The once high and mighty Royal Family is now forced to submit to the strongest being that emerged out of nowhere, serving that entity.
Whether the Blood Moon Demon clan has ever besieged the Great Demon Augustus, nobody knows. Those elder demons of the Demon Clan who are advanced in age have surrounded and attacked that entity, only to be forcefully penetrated by the entity's might; the battle erupted abruptly and ended just as swiftly.
In less than ten minutes, the demons attacking that entity were left barely breathing, lying on the ground gasping for air. Had the Demon King not recognized that entity and pleaded on behalf of the old demons, they would have been obliterated long ago.
That battle also made it clear to the elder demons of the Demon Royal Family just how powerful that entity was, leading to their complete submission.
Not to submit... would mean death.