Where do witches like Agnes and witches in training get their power from? Does Grimalkin have more powerful magic than even Lizzie and Mother Malkin? Also are all spooks capable of using magic, similar to Tom using the mirror?
Spooks don’t usually dabble in magic but Tom is compromised because of his involvement with Alice and his lamia blood.
Magic for witches comes from blood, bones and familiars and is fed by the dark. Grimalkin is very powerful because the focus of her magic is combat and she uses it in combination with her combat skills.