Marvin proved his capability; even if he wouldn't mention it himself, the Church or the Kingdom would likely invite him to become an official citizen of the Kingdom of Windsor.
With citizenship, many things would be much more convenient.
For instance, becoming a designated Magic Potion Dealer for the Church of the Three Fate would require that the dealer is both a native of the Kingdom of Windsor and a follower of the Church.
These little issues had been resolved, but the real key was the bidding tomorrow. The Great Prince and the Third Prince, thanks to their status, had already acquired several magic potion recipes, and Manstein Potion Company needed to compete with them by producing completed magic potions.
"Your Highness, do you think Mercury's Blood will win the bid?" Smith asked, "With the Church's demand for Mercury's Blood being so high, having it should solve most of our problems, right?"