Pieces of Chalk and Magic Markers can be used to write messages that will be visible to anyone in the same tile. Chalk and magic markers come in many colors, and may be used five times before they break and are removed from your inventory. "Fresh" corpses (killed within the past hour) also allow you to write messages - in blood. Doing this is considered an "evil" act and will shift a character's Morality downward by 2 points. Writing a message takes 1 AP. The "Write Message" option appears in the "speech" pane.
In addition to chalk, blood and markers, several class-specific skills allow writing without any items:
- Archons may write in letters made of light with a Blade of Light.
- Revenants may write in icy black letters with an Umbral Sword.
- Pariahs may write in crude scratches with their Blood Claws.
Writing a message replaces any existing message. If you leave the text field empty before clicking "Write Message" you will erase the existing message without writing anything in its place.