Ref eternitygate https://www.beastsofwar.com/project-entry/1635422/

Base Coat

1. Prime with Chaos Black spray
2. Abaddon Black

Edge Layers

1. Dark Reaper
2. Thinned down Thunderhawk Blue to retain transparency
3. Second, narrower layer of Thunderhawk Blue

Alternatives: Mechanicus Standard Grey / Eshin Grey and thinned ???

Corner Highlights

1. Administratum Grey / Dawnstone on the edge corners