Beloril's Leeches

You create three magical Leeches and hurl them at targets within range. You can hurl them at one target or several.

Make a ranged spell attack for each Leech. On a hit, the target takes 1d6 necrotic damage, and the Leech is attached for the spell duration.  

As a Bonus action during each round you can cause one leech to detach transferring you back 1d6 of healing or explode dealing 1d6 of necrotic damage to the target it is attached to.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you create one additional Leech for each slot level above 2nd, and the spell duration increases 1 round for each slot above 2nd.