Transfusion

You transfer some of your animating essence to one target that you can touch, sustaining them and healing their injuries with an infusion of necrotic energy and your own blood. You take 1d4 necrotic damage, which cannot be reduced in any way - the target gains that many hit points.

This spell's damage and healing increases by 1d4 at level 5 (2d4), Level 11 (3d4), Level 17 (4d4) and Level 20 (5d4)