I introduce you to Talika Irawella, young tohunga (professor) of Hydromancy at Arnhem School of Witchcraft and Wizardry. Taking place within J.K. Rowling's famous magical universe, Arnhem is supposedly the school of Australia and the whole Oceania continent.
Miss Irawella was destined to become a Great Barrier Reef's Guardian but she lost an arm and a leg fighting a creature of the Abyss. Thus, she oriented herself towards a more peaceful life by becoming the youngest professor of Hydromancy at Arhnem. She uses her water magic to replace her lost limbs.