"These striders resembled... enormous spiders, or hermit crabs, in a porcelain shell, with legs dark like tar." Clay Dunestriders are spider/crab-like creatures, which its legs are made up of tar. It's shell is a huge porcelain pot, and it has two bright yellow eyes that extend out from each side of the pot. Its fast, and can corrupt things with the tar it has if it wishes to. If it ever talks, it would be cowboy like.