Sigil

You harmlessly place your unique magical sigil,
which is about 1 square inch in size, on the
targeted creature or object. The mark can be
visible or invisible, and you can change it from
one state to another by using an Interact action
to touch the target. The mark can be scrubbed or
scraped off with 5 minutes of work. If it's on a
creature, it fades naturally over the course of a
week.