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 | Withus
Overworld-based: Carboniferous Dimension | Celestis | Clay Dimension | DESOLΛCE | Devonian Dimension | GolemLand | Marsreegana | Misty Graves | Parather | The Alter | The Snare | Upside-Down Dimension | Voidwarp Mine
Sky Dimension-based: Dream Dimension