Going off from that...how about a downward-pointing sword overlaid on or bisecting a cog?
Army of the Creator sounds the most...straightforward...for a group of rampaging mechanical beings, IMO. The others just seem too obvious, if that...
<pokes head in> Ah, hi. Don't mind me, I'll just be hiding in the corner and trying not to get killed. Happens a lot to me in RTS games. A lot....
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