Shadow's Brand

You draw a rune or inscription no larger than your hand on the target. The target must succeed on a Constitution saving throw or be branded with the mark on a location of your choosing. The brand appears as an unintelligible mark to most creatures. Those who understand the Umbral language recognize it as a mark indicating the target is an enemy of the shadow fey. Shadow fey who view the brand see it outlined in a faint glow. The brand can be hidden by mundane means, such as clothing, but it can be removed only by the remove curse spell.
While branded, the target has disadvantage on ability checks when interacting socially with shadow fey.