We will be editing this post tomorrow to make it look good but.
Here are the requirements:
Custom NPC 1.5.2
I hope you enjoy.
You can also access to this New world that we're developing in our server by pressing the button.
WARNING: Always make sure that your forge is at the latest update or else you will crash if you teleport to another world without updating it.
Updating will fix the crash problem. Just overwrite it.