I wanted to challenge myself with something that looks man-made carved into the natural rock formation ( and it's pretty big in size ) . Making this scene in Marmoset Toolbag helped me with approaching this as a game-ready environment - where and how to use modular rock pieces and when to go all in on 1 unique baked asset.
For the mossy parts on the rocks i used tyFLow in 3ds max ( position ray-cast & tyMesher ) to generate the moss patches, then used some displacement inside Toolbag. For the ground textures i used some Quixel tileable materials.