Thanatos's Touch of Salvation

Call upon Thanatos, The Hand of Death, to lead a fallen creature to a painless death

When a creature that you can see within range is reduced to 0 Hit Points by an attack, you may cast this spell and target another creature within range that you can see.  Upon casting this spell, make an attack roll on the target creature.  On a hit, the target creature takes Necrotic damage equal to 1d10 + all damage exceeding 0 Hit Points the fallen creature received from the attack (up to a maximum of 10 damage).  The fallen creature no longer feels any pain as they pass onto wherever its soul may go.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10 and the maximum transferable damage increases by 5 for each slot level above 1st.