Prosthetic Skin

Eiro slowly placed the carefully carved pieces of wood down to the side. He held a small piece of it in his hand and held it to the side toward Bavet, "Try and transform it for a second." 

The slime slowly tapped his core against the wood, and within a quick moment, the finger-sized piece of wood turned into metal. Of course it wasn't real metal, it just looked like it. It still only had the strength of the base wood, which really wasn't all that strong to begin with. And it would probably be hard to spot for others, but it was still possible to see that it was some form of wood, at the end of the day.