When clearing out Merasmus' castle, Soldier found this and gave it to you.

Hey, that magician took your eye. You're not about to feel bad for taking a few artifacts from the bugger.

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New helmet for the Demoman! It's got two LODs, Red and Blu skins (kinda), and paintable gems!

Also, mystical engravings that got blurred beyond comprehension when scaling the UV maps down to 512x512 images, but that's not gonna matter to the person you blast apart while wearing this snazzy piece of headgear.