[She screws up her face a moment, trying to think of how to explain this.]

Well… in my world, e-everybody has a SOUL. Humans have stronger souls than monsters, and they last after death. Monster souls just disappear. But see, uhm… SOULs without a body can be absorbed. Taken for p-power. And since monster souls disappear, but humans don’t… monsters could take human souls. But no one wants that, and monsters would never— no one ever has. But humans were scared. They declared war, and we, uhm, got locked underground.