The Great Wound

Centuries ago, after the death of the Creator Deity, the gods punished the mortal races for their heresy. While every punishment thrust apon mortals was viscous, unforgiving and brutal, none were as absolutely harrowing as the Great Wound.
The Great Wound came into existence as a great ball of fire from the heavens which slammed into the sun elf capital of Thykos, killing all who lived there. The impact of the ball of fire could be felt all across the continent and caused a great flash of light in the sky. When the dust had settled all that was left of the city of Thykos was a crater, one that radiated with the burning red glow of hell itself. It is said that if you were to look into the crater your soul would be ripped from your body and hurled into hell.
After the impact, a militia from the nearby city of Iliodisi was sent to investigate the site and search for survivors, however instead they were greeted by the craters residents. The demons, who crawled from the Great Wound, devoured the militia and tore through the rest of Thykos and spread like vermin throughout Ebra. Eventually, the Bastion was built to prevent more of the infinite armies of hell from leaving Thykos, though Allnema, already poor and fatigued from war with the sun elves, was left as demon fodder. Eventually the hordes of demons seemed to die down, going from overwhelming hordes to smaller clusters. Now, the demons pour from the Wound at a steady pace, though still infinite in numbers, and the Great Wound stains Ebra as a reminder of the mortal races sins.