XWE or Xd_pro's World Edit is an addon made to help builders with creating organic-looking mountans, hills, valleys and more. It is also good for crashing your game with TNT!
Select version for changelog:
Changelog
Added a video explaining how to use the addon correctly.
There is just one problem. It is extremely laggy on some devices, but it *is* bearable so over all, it’s a great pack.