Dimensions

The overworld for years had been exploited of its resources for personal benefit of the players, resulting in the transformation of the overworld becoming the netherworld. Trees have survived this transformation but dont think they can grow back. The netherrack is highly explosive, So dont mine them.

The Dogelands is the lands promised to you. Although never fully completed by its builders. It consists of 5-6 biomes and a simple ecosystem. The stone can be mined with your fists, Making progression somewhat easy. Terraforming is in: Terraforming 

The Dogelands has two subdimensions but those are for you to find.

Virtual Reality is a barren landscape made up of virtual materials. Block placement can be syncronized with the Network Syncronizer. It is unobtainable and can only be obtained via creative (unless i forgot the recipe...)

Structures in virtual reality will appear as if they had naturally generated. They can be useful for exploration or base hunting. More on this in Virtual Reality 

Both dimensions can be accessed by building portals and igniting them.