R: Touch D: Sigil

You mark a room as forbidden. As you cast this spell you mark it with your sigil and name [dice] categories of people allowed to ignore your ward. If an unauthorized creature enters the marked room, the light sources in this room and all adjacent rooms will start blinking in the color of your choice for [dice] hours and the spell ends. Yes, this spell is often used to enliven dance parties.

warning + light

From Number Arent Real’s Banking Wizard