I worked on the textures and lookdev for all three Sakai armor ranks in conjunction with Emre Ekmekci. It was really fun making the oil slick/black version. I used a custom rainbow flowy noise pattern slightly multiplied into the diffuse in our metal/rough shader. Polish and optimization pass done by Emre.
Concept
https://www.artstation.com/johnpowell
Hi res sculpt & additional textures
https://www.artstation.com/emre
Game res model
https://www.artstation.com/trace_studio