Enki's Toll

You create a shard of necromantic energy and fire it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d4 necrotic damage. On a successful hit, the target makes a Constitution saving throw to resist the surge of necrotic energy or take an additional 1d4 damage and disadvantage on next attack roll. On a save the target takes no additional damage and no disadvantage on their next attack from this spell attack.

At Higher Levels. When you cast this spell using a spell slot of 1st level or higher, the necrotic damage increases by 1d4 for each slot level 1st level or above.