You launch a bolt of crackling necrotic power at a creature you can see within range. Choose one ability when you cast this spell, and make a ranged spell attack against the target. On a hit, the target takes 2d6 necrotic damage and becomes cursed until the spell ends. The cursed target takes an extra 1d6 necrotic damage whenever you hit it with an attack and has disadvantage on ability checks it makes with the chosen ability.   If you see the target drop to 0 hit points before this spell ends, you can use your reaction to attempt to transfer the curse to a different creature you can see within 30 feet of the target. Make a ranged spell attack against the new target. On a hit, the new target takes 2d6 necrotic damage and becomes cursed by the spell. The spell ends if you don’t use this reaction when the cursed target drops to 0 hit points or if you miss with the ranged spell attack.   A remove curse spell ends this effect.