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A chaos space marines warband but dedicated to dark machicum rather than chaos Gods,You can imagine them as chaos iron hands, but not Iron warriors.
Their possessed marines and Obliterators whould be very different from normal chaos marines equivalent units——normal possessed marines and Obliterators have a lot of flesh parts, and these dark mechanicum marines that work for dark mechanicum would emphasize the parts of metal,mecha-tentacles,servo-arms and more high-tech aesthetics.

Therefore, it is not intended to conversion from ordinary possessed and Obliterators, but a complete new work. This needs something similar as samples, there are any third-party or homebrew conversion works of dark mechanicum units can be used as a references?

https://www.forgeworld.co.uk/en-CA/Mechanicum-Myrmidon-Destructors