This is Grimalkin, the witch assassin of the Malkin clan of the oldest coven in Pendle. Although she is sent by her clan to kill Tom a reluctant friendship ensues. Grimalkin will not be ruled by any man, not even the Fiend. Grimalkin and Tom use each other's power to hobble the Fiend and rid the county of his evil influence. One of her powers is the ability to transform into a cat. Grimalkin is skilled at wielding blades. Her primary weapons are throwing knives & her long blade. She uses her blades with deadly efficiency and says herself that she "rarely misses". The only time she fails to hit her target in the series is when Tom redirects the path of her blade using his ability to slow time. Her knives are quick and powerful is such a way that Tom describes how even ducking or stepping aside would not have saved him from the attack. Tom describes Grimalkin as "a wheel of death". Grimalkin is also a skilled blacksmith who forges her own weapons, which she carries in leather sheaths about her body.