"Everything has a weakness, even so-called gods. Since this is all hypothetical, my answer is that hypothetically, the weakness of these... gods? Shall we call them that? -- is us." Aornis already knows what she would do to take down these gods or spirits, but unfortunately (or fortunately), it's nothing she can speak out loud to Claudius. That isn't what she wants, after all. She'd much prefer their full cooperation.