Entity: Cataphract Fleshwarp

Source Impossible Lands pg. 28

Your battle-hardened skeleton is laced with additional cartilage and muscle to help bear armor across vast areas of operation, and your skin is bedecked with tiny spurs of pliable, resilient keratin to optimize the grip and weight distribution of your armor. You gain the Armor Proficiency feat. If your class makes you trained in all types of armor, you instead become trained in Athletics (or a skill of your choice if you're already trained in Athletics) and gain the Armor Assist skill feat.