Sapping Smite

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The next time you hit a creature with a melee weapon attack during this spell’s duration, your weapon hisses with a vile miasma, and the attack deals an extra 4d6 necrotic damage to the target. Additionally, the target must succeed on a Constitution saving throw or it deals only half damage with weapon attacks that use Strength for up to 1 minute.   Until the spell ends, you can drain energy from the target. As an action you may deal 4d6 necrotic damage and regain hit points equal to half the amount of necrotic damage dealt.   At the end of each of the target's turns, it can make a Constitution saving throw against the spell. On a success, the spell ends.