Wearet

The Wearet is a sinister cross-breed, and possibly mutant creature that appears to be a cross between weasel and a stoat or a ferret (as mentioned in Loamhedge.) They are extremely large, primitive, ugly, have little neck, no ears, and have a tendency to slobber a lot.

In Mattimeo
Matthias almost died fighting a Wearet who was working as a slavemaster for Malkariss. He was described as having no ears and hardly any neck, with stained teeth and sinew and muscle standing out of his body like cords. His weapon of choice was a net, which was destroyed in battle with Matthias, and a giant stabbing spear. This Wearet has the distinction of being one of the only villains to defeat a Redwall warrior; he defeated Matthias after a brutal battle by knocking him over a ledge. He was killed by Orlando the Axe soon after.

In Loamhedge
Bragoon and Sarobando died fighting a Wearet named Kharanjul and his horde of three hundred who were living in caves in a giant gorge.