100% procedural in Substance Designer. Rendered in good 'ole Toolbag3.
Started with the base rock as a utility and then created multiple instances for a layered effect. This is a WIP.
Sorry my graph is so messy! There are parameters to adjust rock height, and moss amount. I'll clean it up later and upload more renders. I'll be adding this to a material in Unreal that will allow the user to move the height of a set of vines along the rocks!