Abyssal Gate

The Abyssal Gate inside the Imperial City is the source of the invading demon hordes on Aegeron. It was opened by Agents of Chaos through unknown means, many scholars suspect with divine help.

After the Brass Concordat was signed and the joined forces of mortals and devils reached the Imperial City, they found that they are unable to close the Abyssal Gate. So the Demonfence was constructed to contain the endless tide of ravenous hordes pouring out of the gate.