Touch of life

A creature at 0 hitpoints you touch regains one hit point.  This spell has no effect on undead or constructs.

As a first action you apply the blood to the receiving creature. The second action is to recall this one special moment, that made you understand the energies of life and to heal one hitpoint and say the words you have learned to say. You gain a level of exhaustion by using this cantrip, as the energy comes directly out of your body - to safe another person.