Demonfence

After the Brass Concordat was signed the Infernal Legions joined the forces of Aegeron to push back the demonic invaders. Even with the help of the devils it took years and required great sacrifices to push the forces of the Abyss back. But when their forces reached the outskirts of the Imperial City, the devils proclaimed that it is not possible to close the Abyssal Gate. So, they proposed the construction of the Demonfence, a magically reinforced fortifications meant to contain the demon threat. Scholars are divided on whether the devils really lack the ability to close the Abyssal Gate or just chose to leave it open as part of some long term plot.

At first the Demonfence looks like an extremely tall, robust wall that stretched over the horizon, it is over 500 miles long, it surrounds the Minthras Hellscape. But the wall itself is but a fail-safe in case the magical force field that keeps the demons at bay fails.

There are several installations on both sides of the wall. On the outer side are the fortresses of the remnants of the Imperial Legion (now just a pale shadow of its former glory), while the inside houses several installations that the devils use to bring in reinforcements and for other unknown purposes.