After the passing of the Sun Lord, Zebert gradually consolidated power and is now regarded as the de facto Imperial Prime Minister.
In the history of the Empire, such prime ministers are actually not many. In the power structure of the Empire, it is not easy for a power-consolidator to emerge. There have been many instances throughout history, but viewed on the scale of ten thousand years, they haven't been very long-lasting.
Usually, the departments that a prime minister can control vary. Theoretically, the four major chancellors are all his subordinates, but often powerful departments, especially the Military Affairs Department and the Legal Department, are frequently beyond the prime minister's control. A strong and capable chancellor can often pose a significant challenge to the prime minister's authority.
