Rey has some experience with ancient powers. She'd never believed they'd existed before they showed up right on her doorstep, trying to kill her. So instead of immediately scoffing, she falls into a short, contemplative silence. Her response, when it comes, is simple: "Don't know exactly what you mean, but I've heard stranger things." At least she believes him. Mostly.

Instead of continuing that train of thought, she glances back to the water. "It isn't toxic, exactly." Elaborate, Rey. "It'll help with fatigue, but once that wears off, it makes you even more tired."