The first part of the Infernal Abyss is a barren and burned wasteland full of massive skeletons similar to the Ruborian Desert. The second part is a huge, dark maze full of imprisoned peasants and abyss plants that block the passage and they open up when a chained peasant is set on fire. It's also the place where Kahn is being tortured. The third and final part of the Infernal Abyss is The Forgotten God's Lair.
In the outskirts of the Infernal Abyss, the Third Overlord fought a massive horde of Wraiths and, after he defeated them, he proceeded deeper and entered into a dark Maze where, at its end, he encountered Kahn, or what was left of him, pilled up in a wall. After using a Shock Trooper to ram through Kahn and turning him into pieces, he found the Forgotten God's dwelling place, which required him to lit up a group of chained peasants with some switches in order to open the gate and face The Forgotten God inside his lair.
Behind the Scenes
It is possible that the Infernal Abyss is loosely based on Dante's Inferno.
- Unlike the other four abysses, there is no unique Mold to be found in this abyss.
- Outside the Forgotten God's lair, there is a furnace where you can burn peasants which respawn, making it an infinite source of lifeforce.