Iron man is teleported to a random part of the galaxy on a earth like planet and starts to gather things to use for resources. He is wearing his all new all different iron man armor. He will not be discovered for 1 month. Who will win?
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Im pretty sure the emperor could have -blam!-ed anything up in his prime, as in before Horus crippled him, even then i doubt iron man could survive shit like the K'tan or a chaos demon, or a tyranid assault, or a grey knight strike force, or a Tau cadre. Literally everything in 40k is designed to be over the top.