Drain Life

You reach out at a creature to drain it's life force. Make a melee spell attack against the target. On a hit, the target takes 1d4 necrotic damage, and you regain a number of hit points equal to half the damage dealt.

This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).