Creeper was a small dark-furred hedgehog who worked for King Silverbirch and appears in Urchin and the Heartstone. He is the King's assassin and spy. He never grew to full adult size, and used it to his advantage to hide in small places and wait for his victims. Creeper is taken to Mistmantle in a chest, and hides in Lord Treeth's cabin. He later journeys back to Whitewings secretly and tells Silverbirch about the mole army that is coming to rescue Urchin.