New dimension

What if, when you go to light a nether portal, there’s a 19.32% chance that instead of purple, the portal is black. I’m calling this dimension “the Opposite”. It’s like the Overworld, but different. There’ll be new mobs, blocks, and it’ll be covered in a black fog, kinda like the blindness effect. It might not be the best thing, but it would be kinda cool, I guess.