Iron

https://www.reddit.com/r/ageofsigmar/comments/1pg0xpk/slaves_to_darkness_test_model/

1. basecoat model color dark rust.
2. cover everything with metal color burnt iron.
3. glaze shadows with a mix of dark rust and burnt iron. I used an airbrush but mostly just for speed.
4. very dilute wash of army painter dark skin shade. About 4:1 medium/water to paint. Add a drop of gloss varnish, wick away any pools, and brush away from raised surfaces.
5. very gentle bright silver drybrush to catch edges. I used mig drybrush light metal but any bright silver will do.
6. glaze army painter dark skin shade, dark red tone, and dark blue tone into recesses. Just a subtle filter, not a wash.
7. very small bright silver highlights to the sharpest edges. I used game color silver but any bright silver will do.