Curse of the Blood-Starved

You inflict a target within range with supernatural withdrawal. The target must make a Constitution saving throw. On a failure, they are cursed for the duration. At the start of each of the cursed target's turns, it takes 2d6 necrotic damage. The target can choose to knowingly give into its bloodlust to suppress this damage; if the target chooses to gain 1 point of Adrenaline or Trauma at the start of its turn, it takes no necrotic damage from this spell for that round, but all attacks made against it have Advantage until the start of its next turn. At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the necrotic damage increases by 1d6 for each slot level above 2nd.