Apparate a necrotic sickle for 1 minute. While this is active you may make a single free attack per turn, dealing necrotic damage and causing withering.
This attack does not have to be made during your turn.
A jagged sickle of shadow coils into your hand, edges dripping with black mist. Each swing slices air and soul alike, carving necrotic lines that splinter flesh and leave skin brittle, graying, and cracked.