Shadow

Though it is unclear what species he was exactly, Shadow's fur was pitch black, giving him natural camoflouge in the night. Shadow was also an accomplished climber and burglar. His ability as a spy made him very important to Cluny the Scourge, who ordered Shadow to infiltrate the Abbey and steal the tapestry of Martin the Warrior in an attempt to demoralize the Redwallers. While Shadow did manage to cut out Martin's picture, he was discovered by Matthias, who sounded the alarm. Shadow made a run for it, but was stopped at the top of the wall by Constance who when trying to subdue him accidently knocked him over the wall still holding the tapestry. Cluny recovered the tapestry at the bottom of the wall and ran for it, while the Shadow died shortly after.