Kaymon the Gorgon Hound is the fourth book in Series 3, The Army of Darkness. Kaymon is a terrifying, powerful canine Beast whose dark magic likely involves the ability to paralyze or turn victims to stone with its gaze, like a traditional Gorgon. Tom must confront this Beast in an environment filled with statues, signaling past failures. The mission requires Tom to use mirrors or find ways to fight the creature without looking directly into its eyes, which demands immense skill, speed, and planning. The narrative focuses on the dangers of direct confrontation and the need for clever, indirect strategies to defeat a foe with petrifying abilities.