Tartarus

Tartarus, also known as The Hellish Plane is one of the two realms that consist Onyria(along with Eolia).

Tartarus is known to be the harshest places in Onyria, mainly because of its toxic atmosphere and extreme heat. No man has survived long in this realm.

Also known to be the birthplace of the orcs and the habitat of the Devilkind.

Geography
The tartarian atmosphere contains a lot of toic chemicals and powerful mutagens, being an impossib le enviroment for most lifeforms, except orcs and demons. Also, average temperature is over 800 K, making exploration impossible even with the most advanced vulcanologist vest.

The surface is filled with volcanoes with neverending eruptions, so lava flooding is a common threat. However, there are a lot of caves that serve as shelter for those lethal floodings.

In those caves, many demon fortresses and orc camps can be found.

History
Tartarian history had been more or less the smae, as demons are unable to progress as a civilization. Orc technology is extremely primite and they can´t master magic.

Age of the Legion
Since the core was destroyed, demons were freed from their role of prisionkeepers of the New Gods. However, their evil minds didn´t changed.

With a new world with the perfect conditions, the demons established a plane-wide empire quickly. They also ensured their position of domininant race in Tartarus by exterminating the rest of survivor wildlife.

However, they did not suceed. The mutagenic gases of the tartarian atmosphere transformed most of the human survivors into feral abominations known as orcs. Demons tried to exterminate them, but their tenacity was at par with their fury. They managed to create several clans to protect themselves against the hellish threats.

The 4th sinneswald started in the year 281 A.C.E., when the Hell War started.

Hell War
One day, Feuras the Impious, an Overlord , decided to attack the lands above the Siliph, Eolia. With his powerful legions, he started to ravage the Eolian lands and destroy all life.

But there was a problem, men foreseeing the consequences of the demonic invasion, decided to forget their inner conflicts and create an alliance able to stop the Overlord´s ambitions: the Eolic Alliance.

While demons outnumbered the Alliance, they had the power of the industry and the airships .The demons were slowly decimated by the powerful human gunpowder weapons and mage spells and they had to retreat.

This defeat meant the 5th sinneswald in the year 0 A.C.E.

Age of Shame
This defeat dishonoured the Legions and left their forces severely aweakened. Also, the Overlord died during the retreat and the Archdevils couldn´t find any substitute for the Dark Metamorphosis.

This, along with the creation of the Council of Gruul, made the orcs stronger. Fortress that were considered undefeatable were suddenly mercilessly raided by the orcs.

Devilkind is aweakening and has entered an age of decay.