Vampire Bat

You summon a flying, spectral bat within range that lasts for the duration or until you cast this spell again. When you cast the spell, you can make a melee spell attack against a creature within 5 feet of the bat. On a hit, the target takes 1d4 necrotic damage.  You then regain hit points equal to half of the damage dealt (rounded up).

As a bonus action on your turn, you can command the bat to move up to 30 feet and repeat the attack against a creature within 5 feet of it.  The bat may never move more than 60 feet away from you.  If your own movement or another effect would make it so you are more than 60 feet from the bat, the spell ends.

AT HIGHER LEVELS: When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d4 for every slot level above 1st.