Thanks for the remedy

S1, E6: Yanna is sick: she has a rash all over! And it looks as if she has infected Melchior. Yanna has made fishhead soup, and Melchior bravely tastes it, but after eating it he feels very unwell. The right remedy calls for secret ingredients such as a cobweb of the red spider, etc. But time is running short: Melchior must take the remedy before sunset, or the sickness threatens to be very dangerous.