The Mark

Casting this spell allows you to mark a humanoid with a roguish arcane sigil. While the spell is active and the target remains on the same plane, you know their exact direction and general distance from yourself. The target has disadvantage on perception checks against you for the duration of the spell.

When casting this spell, or when attempting to locate the brand on their person, the target can roll Perception with Disadvantage against your Spell DC.  If they succeed they learn that they are being tracked but the spell cannot be dismissed short of a wish spell.