The world powers are very terrifying when they truly get serious.
The resources they have, the manpower they possess, the kind of weapons and magical means that they could employ is endless.
Especially those who had deep foundation and a large pool of talent like Pandemonium, the Republic and the World Government.
Because they were ones of the first that was established, they attracted more talents.
And most of them had cultivated that talent as such it is not as easy to compare their achievement with the upstart that is the Four Great Powers.
Most of them hide their true power, used only in desperate measures when their own survival is threatened to the point of no return
And while it almost seems like Azief is invincible right now, he is not.
Loki would say that only Sovereigns are truly invincible. It is the reason why a Sovereign is enough to deter all forces in the world and in the Universe.