Shole

 is a dimension below the Nether that can only be accessed with the Shole Portal. Here is the recipe for crafting the Shole portal: O O O O D O O N O

Legend
O = Obsidian D = Dragon Egg N = Nether Star

What it looks like
Obsidian with an end portal frame on top and nether stars on all sides (except on the bottom).

How to get to Shole
Upon crafting the Shole Portal, go to the nether and place it on soul sand. When you set it on fire, the block becomes tile.null.name (a block to the end). When you step into the portal, it looks exactly like the overworld, except the fact that it is dark as the nether, all blocks are obsidian (except for the topmost layer, which is bedrock, and the bottom-most layer is lava), there's no trees, and only wither skeletons spawn here. To enter The Real End, craft this: W O O W

Legend
W = Wither Skeleton Skull O = Obsidian

What it looks like
Again, obsidian but with the Ender-Colossus' face on all sides.

The Dark Void
In the Dark Void, you'll have to fight the Ender-Colossus! Doing so will earn you the achievement, Into the Void The Ender-Colossus' has an ungodly 600 (Hearts x 300) HP! Basically, it is the same layout as the end, except that the Ender-Colossus tries to crush you with these obsidian pillars (the explosions from the ender crystals will deal severe damage, but they'll regenerate due to the energy of the Ender-Colossus). Arrows do affect him, your time to strike is when you shoot an obsidian pillar (the one that the Ender-Colossus is holding) with a bow 3 times, then you can fire at his body.

Trivia

 * The name, Shole comes from Sheol.
 * The Ender-Colossus comes from here.