Arcane Chalk

Letters or symbols written with arcane chalk will vanish after a few seconds and then can only be percieved with an active Detect Magic or True Seeing spell/ability. They last until dispelled or cleaned away with salt water. (Intelligence (Arcana) Check DC 16)

The chalk has 20 uses. You can write 25 words in sizeable letters per use. Depending on the size and complexity, drawing with the chalk costs a number of uses at the DM's discretion.

Notes: Communication, Utility, Deception, Warding, Consumable