Ingredients: Mirror, sufficient human blood to write the message, UV light.
Process: The practitioner designates a type of individual in their mind — e.g., mortal, ghoul, vampire, male, a child, unemployed — and bathes a mirror in UV light. The sorcerer writes a message on the mirror with a fingertip, using human blood as the ink. The message appears on another reflective surface (a mirror, polished glass, water) the practitioner has seen before and can mentally recall, when the designated type of individual passes by.
System: The sorcerer makes the Ritual roll when enchanting the designated surface. For every success the practitioner rolls, the message will repeat for each new individual of the chosen type who passes the surface. The message clears itself from the surface as soon as it’s been read once. It appears in the handwriting and language in which the sorcerer wrote it.