Ideas for a mod with a new dimension (2023.4)

Hello!

I'm currently working on a new Minecraft mod for Forge 1.20.1 with a new dimension as the big main feature. However, I'm having trouble thinking of ideas for what the dimension should be and what should be in it (biomes, mobs, etc.) Here's a list of what ideas I would like:

• The name and main theme of the dimension
• What the dimension's main block should be
• 3 or more biomes that the dimension is made of, and any special blocks found in them
• Passive, neutral, and hostile mobs that are found in the dimension
• Important items found within the dimension (special materials used to make new tools, items used for an important crafting recipe, etc.)
• New advancements, goals, and challenges that you can get in the dimension
• Structures that generate within the dimension
• A new boss that can be spawned with blocks and materials from the dimension, as well as special abilities that it has and any special rewards for defeating it
• Blocks and materials that should be used to build and light the portal to the dimension

Your ideas are greatly appreciated!