Darjhen’s Lightning Helix

As you extend your hand, blue and red lightning crackle down your arm before arcing toward a creature within range. Make a ranged spell attack against a target you can see within range. On a hit, the target takes 1d8 Lightning damage and you heal for an amount equal to half of the damage dealt rounded down (minimum of 1). 

At higher levels. When casting this spell at 2nd level or higher, the target takes an extra 1d8 Lightning damage for each slot level above 1st.