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Here's a pair I've had in my head a while, might've even posted about them before. It's a Poison/Steel armored copperhead that evolves into a rattlesnake that uses its old armor as a rattle. New to this incarnation is that rattlesnake, instead of also being armored, is sleek stainless steel, excepting the end of the tail. The copperhead would obviously be copper-colored, maybe a bit mottled with rust. Names I'm not certain on, maybe Copparmor and Crotaleel.