Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download SCI-FI Terrain Pack 1 Free.
SCI-FI Terrain Pack 1 v1.0
This pack contains materials for sci-fi terrain creation.
You can create object based terrains/levels.
55 terrain planes combined in 5 materials.
Every material provided with PBR (metallness) support. Included maps are: albedo, metallness, 16-bit (per channel) normal map, occlusion, emission. Almost every material has alternative texture. All textures are 4K.
Email me if you have any additional questions or want a demo.