Transference of Life

You relinquish some of your health to heal another creature’s injuries. You sacrifice yourself and take 4d8 necrotic damage, and one creature of your choosing, that you can see within range regains a number of hit points equal to two times the necrotic damage you take.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.