Not sure if this is the right place; direct me elsewhere if it's not.
I need a mod that allows me to create sub-worlds. Dimensions. Whatever you want to call them. Here's the goal.
I have a vanilla overworld with a few rogue biomes in it, like from Vampirism. The modpack I've been building and tweaking and testing relies heavily on exploration, so I want to create a sub-world that people can either teleport to, portal to, or command-block to. I want this sub-dimension to be BIOMESOP (biomes o plenty) world generation.
That's it. That's all I need. But it seems like every dimensions mod I can find either lacks the ability to actually create this kind of dimension, or absolutely hates Sponge.
Please help me.