Need Ideas For 101 Dimensions!

You could add a boss dimension or a super hard dimension, like the reverse of your peaceful one.

Create 101 dimensions. xD

Add a dimention full of floating islands

I was thinking of the Noob Dimension, it would be a really cool concept if well applied but that wouldn't fit my mod so well, so here is the idea:

A dimension full of noob houses (dirt cube houses, noob houses in general etc.)

Dirtium ore that you can get with a wooden pickaxe, you can smelt it and get dirtium ingots that can make low-level set but with with a special power that can make it more useful in the noob dimension idk

Mobs: strange mobs, maybe noob-versions of existing mc mobs (so you could just take the AI of vanilla mobs when making them)

Boss(My idea): Noob Overlord - drops the Supreme Sw0rD (obviously it must be useless but maybe fun to use)

Ok hope this was helpful! :)