Gabool the Wild

Gabool the Wild, king of all searats, was the main villain in Mariel of Redwall. Gabool ruled from Fort Bladegirt, on the island of Terramort. One of his fleet captured Mariel Gullwhacker, her father Joseph, and his Joseph Bell en route to Salamandastron. Gabool was a ruthless rat, killing off enemies right and left. This led to him being deserted by his second, Greypatch. Eventually, Gabool's obsession with the bell he had taken descended into insanity, and he wound up being killed by his secret weapon, Skrabblag the scorpion.

Books
Gabool appears in Mariel of Redwall.