Midjourney -> Photoshop -> ArtEngine ->Toolbag with some setup in 3DSMax. I prompted Midjourney to create some rot and decay, and after several variations found something that lost tiled. I used ArtEngine to generate textures for a material, making use of the latest AI Normal Generation and Albedo nodes. I used a neural filter in Photoshop to generate a simple depth map, which I blended with a Normal to Height node before exporting to Toolbag 4.
Animation showing fungus growth, 3DSMax and Toolbag
Displacement with animated UVs and volumetric SSS
Closer to original Midjourney palette