Eadknairese armor, Thrimas period.

Formidable sets of armor like this date back to the rule of Thrimas dynasty of Eadknair, spanning some two hundred years. Produced in quite large numbers, these sets shared most of the parts, with some variance in shape or decorations, depending on the owner's rank and role. They were highly practical, comfortable for the most part, and therefore not heavily adorned, but still had style.

This particular plate was used in Eadknair's campaign against the Centermages. That didn't go well. The centermages ended up with huge piles of steel-setar alloy junk (cleanly separated from it's vaporized owners), which they, being by and large the robed pricks, hardly had any use for. So they quickly made some of those suits into magically animated armor to guard whatever arcane treasures they deemed fit.

After several more decades, some clever bounty hunters came across one, and decided to capture the beast. After some careful preparation, they lured the walking tin (a stupid creature, if anything