Demons

The Demonic Legion, simply known as Demons, are a species of maleficent beings who occupy approximately a third of Earth's territory after the Fall of Earth. Though now scattered, they were once a united force almost a few billion strong which threatened to wipe out all human life. They were once under the common banner of the Great Triune, but began to fall apart after the Human counter-attack in Antarctica known as Operation: Final Effort. They now stand under three banners, those of Ruin's Legion, Chidori's Host, and the Wanderers.

Demon biology
Demons themselves come in many shapes and sizes, but all share the universal constant that they are, simply, beings of evil. There are three overall types of Demons: The Unwilling, the Hellspawn (or Hell-Borne) and Augmented demons.

Demon factions
With the exception of those under the direct command of the Triune, demons mostly live in packs of other demons of the same kind. Primarily demon behavior differs based off the continent they occupy, with a few exceptions. Though typically scattered in combat, they are nonetheless deadly. On the other hand, Demon Houses are those under the leadership of higher-ranking demons or the Triune itself. Generally more effective in combat but rarer due to the scattering of the Triune across Earth.

Demon races
Demons of all three species have many divisions, or "sub-classes" that comprise each species. Generally Unwilling are uniformly simply different variations of corrupted humans, but the most variety lies in Hellspawn and the Augmented species.

Transportation and artillery
Though most of their forces lie in brute ground strength, the demons have themselves acquired a few Earth technologies and integrated it into their arsenal. This is primarily the case with Cyberdemons, but also a few artillery batteries and heavy weapons have been repurposed to suit the needs of Demons, generally of the House variant. In addition, a few biological terrors were brought with the demons from Hell, which they use as transportation and to spread their flora across the planet.

Allies
As it now stands, the Demon forces have very little in the form of allies. Due to almost universally attacking humans on sight, the only allies to the Demons are followers of the Eldritch Triune.

Enemies
The entirety of Earth's population are their natural enemies. As humanity struggles from the dark age of the Fall of Earth, they continue their seemingly-endless struggle to fight off the Demon's assertion of their flora and fauna on Earth.