The ivth. Once a company of iron warriors subduing and drawing various worlds into the fold of what they envisioned as mankinds grandiose empire. Hoping someday to ply their skills as builders in creating wonders. After losing many of their most promising architects engineers in thankless and forgotten in this war. Innumerable battles who’s necessity…
Iron warriors and austere chaos.
So in my opinion of the chaos legions, Iron Warriors are not fond of being lost and damned. I am not telling you how to build yours but mine are a warband that rejects the “gifts of the dark gods” and generally hates warp born mutation(with occasional exceptions). I generally model them as renegade astartes….