ok. I have been looking for this for awhile now and once I got a download link for it was broken So after many hours of punching my computer I did it myself!
Have You ever wanted to get somewhere (like over a wall for example) but didnt want to use hacks? Well, Campfire---->Darkportal is for you! Simply put the file in your data folder and create a campfire! Instead of a campfire a darkportal will spawn allowing you to access high places. (Why a darkportal? Because Its got a huge staircase!) And after a little trial and error you can stack them pretty well to
Uses: Getting over the gate in AB.
Crossing gaps when mountain climbing
Getting to the top of cities.
And basicaly whatever else you can think of
anyway, heres the download link Click me
PS: Be careful. To others it will apear as if you are climbing air.