Board Thread:Warhammer 40k General Discussion/@comment-24037808-20150120110001/@comment-70.31.48.206-20150120120617

I fail to see how your battle robots would really differ from anything the adeptus mechanicus already uses. They merely use certain organic parts in lieu of mechanical and sometimes as little as a lobotmised brain. The daemonic engines of the Dark Mechanicum demonstrate that Chaos can corrupt machine as well as man. Also, in the Tanith first and only series, and STC construct that can produce Iron Men is found and destroyed, both because it is heretical and because it has been corrupted by chaos.

Tyranids: Could still consume and use the metals involved in Iron Men construction. We as human need a certain amount of iron in our diet, I believe a hyper evolved organism such as the Tyranid could fine a use for it.

Orks: If the Imperium felt chemical/radiation warfare was a viable option against the ork they would already be using it and to hell with its effect on the common trooper. There's always more where they came from. However, using such methods would render a planet even more uninhabitable than the odd feral ork warband. The difference being a feral ork planet at least result in the planets inhabitants being bad ass themselves. An irradiated wasteland is just that.

Chaos: While I can see your argument here, again, Chaos can corrupt machines as well as living beings. Moreover, machines would have a disadvantage as their minds/processor would be entirely unable to calculate for something as ethereal as chaos. Faith is a weapon in the 40k universe, whether its in the Emperor or the Dark Gods. Even the Tau have faith in the greater good.