Birch’s Sapping Grasp

A spiral of inky black lightning with a red glow wraps around your forearm. Make a melee spell attack. On a hit, the  tendrils wrap around a target creature and it takes 1d6 necrotic damage, and the caster heals 1/2 of the damage dealt.

on a critical hit, healing is instead 2x damage dealt

At Higher Levels

this spell’s damage increased by 1d6 when you reach 5th level (2d6) , 11th level (3d6) and 17th level (4d6)