True Were-worms were formidable monsters. Wingless, they resembled Cold-drakes, except that they were long and very slender and were usually reddish brown or green. Like Cold-drakes, they were powerful spell-casters; however, Were-worms concentrated on their ability to magically alter their form. As powerful shape-changers, they could elude, bewilder, surprise, terrify, or simply overwhelm their foes. A Were-worm could reduce or increase its size by as much as fifty percent of its mass, assuming any form it could actually see (or envision in detail) at the time it altered its shape.