QuietThinker, the idea i had is Rauchnaut's "core" connecting him to the body via a magical aura channeled throught it (hence the ability to pinpoint dealt damage without actualy looking at the damaged area), allowing him to pump pure magic through the body, turning it into electricity upon reaching the muscle. Since the whole body is actualy connected to his magical aura, any sort of electrical conductor would be inferior, as severing it will interrupt the signal, whereas the magical aura can be used to flex muscle even if there is only a single string for it to go through, using ALL of Rauchnaut's body, even armor, as a conductor.