Transfusion

Choose one creature to attack and one creature to heal. Make a ranged spell attack(on the one you're attacking, unless the target is willing.) and roll 1d6 necrotic damage + your spellcasting modifier the amount you roll is how much damage and healing you do.

Please note that both the attack target and the healing target must be within the spells range.

Add 1d6 for every spell slot level above the 1st.