Transfer life

You use an ancient technique to control life force with your fingertips. Make a melee spell attack against the target. On hit, deal 6d8 necrotic damage and give temporary hp equal to damage dealt. All allies who are given temporary hp lose the exhausted condition. Take 1d4 damage on a miss.

Using higher level spell slots. You deal 1d8 more damage for each spell slot level. At level 13 you gain the ability to give the temporary hp to two creatures at a time, giving the same amounts to both as if you were giving it to one.