Multi-overworld adds a second overworld that is a mirror of the first one. The second overworld can be accessed by crafting a World2 Portal block!

Fully supports

- Oh the biomes you go

- Biomes o' plenty

- William Wythers' Overhauled Overworld (Must be in compatibility mode)

- Terralith (requires an addon mod which can be found Here)

Thanks to 

AridGnat313813

for updating it to 1.20.1

This dimension can also be fully modified using data packs A guide will be out eventually for this.