Problem regarding terrain generation

Hey there i am trying to make a game which has spawn world in which :

  1. I want a terrain to be supper realistic but the default terrain editor is not realistic.

2.In my lobby world i want the world to be realistic,and related to Fantasy like a magical world and contain fog like the one templates Move It Simulator On Roblox Studio

So is there a plugin or any other way to achieve what i want??

You have to make all the terrain by hand in blender. How To Build Realistic Terrain (PBR Textures) [Surface Appearance] {ROBLOX Studio} - YouTube

There, hope this helps.
The terrain maker is actually pretty realistic for example in ZO.