Atmos Dimension

This is an idea I had a while ago, similar to an Afterlife Dimension, or a Heaven Dimension. However, it has a new twist to it:

It's only accessible through Hardcore.

It's an Alternate Dimension above the clouds of Minecraft. Just above the build limit, there is the Atmos Barrier, at height level 275. And, just below the Upper Void, there is the Atmos Dimension. The Atmos Dimension is a second-chance land for Hardcore players. If you beat the Ender Dragon, you get an optional portal to enter the Atmos Dimension.

The ground of Atmos is cream colored clouds, and water falls that hit the Atmos Barrier split up the different lands/biomes of Atmos. The layout of Atmos is like a Kingdom, with a central fortress and surrounding Atmos Colonies.

Great rewards and great dangers can await you if you dare travel there! 

I think it'd be a great experience, any ideas to add on...?