Blood Leech

You fire a red leech from from the center of your hand at a target. Any creature hit must make a dexterity saving throw to dodge out of the way. on failure the leech burrows into part hit, they take 1d8 necrotic damage that is restored to you until 3 rounds are over then the leech will force itself back out of the part where it hit.

At higher levels
On hit damage dice increases by one d8 for each level