Salazar The Blade Of Destruction.

He continued on his journey while his words reached the demon noble immediately after the death of the messenger. The demon noble obviously popped his lid in anger.

In A City Within The Domain Of Demon Nobles.

Planning, scheming, trickery and world invasion start at the high-rank demon level. That's why the domain of high-rank demons has fortresses constructed around abyss altars. An invasion needs an army, and an army needs order. So high-rank demons are the first pillar of order in demon society. While mid-rank demons manage territories and rear demonic beasts, high-rank demons manage fortresses and invade worlds.