The Underworld is the evil Realm of Shadows and Chaos that the dead enter. It is a forbiden realm because of it's Shadowy and Chaotic Reputation. It is ruled by the Underlord.
| Nether-based: | Collother | Darkness Dimension | Nether (Minecraft: A New Start) | The Quether | The Underworld | Voidwarp Nether
Overworld-based: | Carboniferous Dimension | Celestis | Clay Dimension | Devonian Dimension | GolemLand | Marsreegana | Misty Graves | Parather | The Alter | The Snare | Upside-Down Dimension | Voidwarp Mine