The next time you hit a creature with a weapon attack before this spell ends, your weapon is sheathed in necrotic energy. The target takes an additonal 3d10 necrotic damage, and you can regain a number of hit points equal to half of the damage dealt. The target must make a Constitution saving throw. Upon a failure, a black, intangible cord of necrotic energy forms from your weapon connecting to the target's heart. Upon a success, the target and you take an additional 1d6 necrotic damage, and the spell ends.
On each of your subsequent turns until the spell ends, you can use your bonus action to deal another 2d10 necrotic damage, reduce their movement speed by 10 ft., and regain a number of hit points equal to half of that damage, or you can grant these hit points to an ally within 10 ft. of the target, causing a small wave of life energy to shoot towards them from your weapon.
If you cast another spell while conentrating on this spell, you must make a Constitution saving throw with a DC equal to 10 + the spell's level. On a successful save, you continue concentrating on the spell. On a failed save, the spell immediately ends, and you and the target take 1d4 necrotic damage, as your spell breakes the delicate nature of this spell, the necrotic cord shattering.
You must remain within 15 ft. of the target. If the target is outside of the range by the end of your turn, the spell ends and the cord of necrotic energy is severed. If you stop concentrating on this spell by any means, the cord severs and your sword returns to normal.
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