The Wraith

The Wraith was a weasel who followed the horde of Swartt Sixclaw, and was discovered by Nightshade. He was skinny and undersized, and when the Wraith spoke he extended his 'R's. Wraith had no teeth, and carried a tiny poisoned stone knife. He had the ability to camouflage himself against any background.

The Wraith was hired by Swartt to assasinate Sunflash the Mace in exchange for 50% of the pillagings. To demonstrate his deadly killing methods, Wraith slew Glimpy in front of Swartt.

Wraith actually climbed up the mountain of Salamandastron to get to Sunflash. However, when he leapt from underneath the window ledge to attack the unsuspecting occupants, 2 pies thrown by Porty at Folrig and Ruddle missed and hit the Wraith instead, sending him flying into space and making him accidently stick himself with his own poisoned dagger.

Books
Wraith appears in Outcast of Redwall.