Stegocentipedes are arthropods grown to stunning size. They are rumored among sages to have come to the Material Plane from another plane or dimension, though no proof has been found to support this theory. It is based chiefly on the fact that nothing else like them exists. A typical stegocentipede is 18 feet long, but there is much variety among the species. A stegocentipede raises its spines instinctively when it enters combat, and it moves constantly in a back-and-forth, sawing motion as it fights.