Apocalypse Bringer Mynoghra, Vol. 6 (manga) - World Conquest Begins with the Civilization of Ruin (Clone)

With Isla slain in the climactic battle between GSG and RPG, Takuto charts a new course for his peaceful wicked nation— The ascendance victory. To win in this manner would resurrect all their fallen comrades, but it will be no easy task. If they hope to stand against the entire continent, they’ll need new weapons, facilities, territory, and citizens. But their path to victory will not go unimpeded, for Erakino and Soalina have joined forces to stop them. Backed by the Holy Kingdom of Qualia, they train their focus on the source of the continent’s evil— The king of Mynoghra himself.