"Physics." She laughs, she really does, merry and sad. "How direct! If I'm understanding you correctly, your understanding is that your arm and other technologies of your home are rooted in the principles embodied in the six simple machines...only..." Arche frowns thoughtfully. "How was it powered? Necromancy has some definite statements about the total power one can wring from a human body, and I can't envision a solely mechanical way that it could be siphoning from the soul..."