Dukino's Leeching Lance

You hurl out a large lance of blood and bone at a creature you can see within range. Alternatively, you can utter a creature’s name. If the named target is within range, it becomes the spell’s target even if you can’t see it. If the named target isn’t within range, the lance dissipates without effect.

The target must make a Constitution saving throw. On a failed save, the target takes 7d6 necrotic damage, you gain Temporary HP equal to half the damage dealt, and the target suffers from the Chain Link condition for 1 minute. On a successful save, the creature takes half as much damage, and you gain Temporary HP equal to half the damage dealt. 

Chain Link. While afflicted, each time the target fails a Constitution saving throw, you gain 3d6 Temporary HP.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th