[Suzerain of Sheol]

Catherine maintains a smiling facade while deciding to bend her clairvoyance to her new master, more in disbelief at his lack of preparation for the Grail War, than for anything else. And sure enough, he is as ignorant to all this as the innocents of Heaven she'd cast to Hell would ever be.

Clucking her tongue, she tilts her head the other way, condescension narrowing her eyes. "Oh, mon petit seigneur chéri, but of course. Allow me to regale you with my wisdom. If you would do us both the favor of looking, you shall see that through our bond, you are aware of my abilities as your Assassin-class Servant. I am all but undetectable to our enemies, and possess powerful alchemical magic, on which note..." she snaps the fingers of her left hand, and produces a small vial filled with some frothing concoction that seems to roll through a variety of ugly colors. She proffers it to the boy. "Do take this, it will inure you to the particular flavor of mana I prefer to employ. I'd hate to see you heaving up those beautiful young organs of yours, so be a dear."