The Netherworld is where the first minions were said to have been spawned, and where Gnarl and the other minions fled to after the Third Overlord was trapped in the Infernal Abyss, and shortly before the Dark Tower was destroyed in the Great Cataclysm.
Here the Fourth Overlord solidifies his seat of power in the Netherworld Tower.
An artwork,showing the gothic,demonic design of the Netherworld.