Dark mist

In a mountain range formed over the enormous carcass of a Rank 6 Devil Lord, a war between millions of devils occurred.

Thousands of explosions befell every second as squads of lesser devils clashed among each other, all of them displaying excellent military strategies and organization.

A few thousand kilometers above them, hundreds of Rank 4 Devils fought with their Law Avatars, displaying powers that could level entire cities. These devils killed each other and guided the soldiers beneath them, showing the wisdom that made the devil race famous. 

Despite the mighty powers the Soul Forging existences showed, their battlefield was far from being the highest. That title belonged to the one that was hundreds of thousands of kilometers above them where Devil Lords fought.

The shock waves the Devil Lords' fight provoked could cause severe harm to a continent, and just the energy they released was enough to melt anything beneath Rank 4.