So this was recorded in Maya, however the same basic ideas should follow over to other 3d software. Also I may end up just making a written tutorial since they are easier to follow.
This is the workflow that Ravanna used to create the West Gash cliffs among other things, So it is tried and tested. If you want to use this method the only 'real' requirement is to have a height map that is very solid, with lots of contrast.
You can get the trial version of Knald here: https://www.knaldtech.com/get-knald/
https://www.youtube.com/watch?v=8mHYTvUUs0Q
If you want to try this out then feel free to download the textures I used in the video here
https://dl.dropboxusercontent.com/u/1244197/SkywindAssets/MossyCLiff_specular.zip
This should be the final result

Knald? Did Ravanna work with
Knald? Did Ravanna work with maps generator? I don't believe))