I was responsible for creating all the base terrain Materials for the inside of the mountain. I mainly sculpted everything by hand, and ended up using a combination of substance designer and zbrush to get the results i wanted. In the end, these base materials were used to create a wide variety of layered paint materials. Once we started polishing i made vertex blend materials to create "skirts" to cover up seams. These materials relied heavily on the height information and the blending parameters to create a very seamless and natural look.
From top to bottom, showing the level of detal complexity of each material.