Doesn’t DDO have presets for UE4 now? For a basic model with UE4 you just need a albedo/diffuse/base color (they are all basically the same thing), a roughness map, and a normal map. If you have a mix of metals and non metals you’ll need a metalness map as well, but otherwise that can be a constant 1 or 0. Don’t mess with a specular texture or value unless you need to, leaving it unused is more physically correct when you are trying to make something match the real world.