Divine Mark

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects and it is marked with a visible mark until the beginning of your next turn. The next time the marked creature is hit by an attack by a creature other than you, the attack deals additional radiant or necrotic (your choice) damage equal to your spellcasting ability modifier and the mark is consumed.

At 5th level, the melee attack deals an extra 1d6 radiant or necrotic damage to the target, and the damage when consuming the mark increases to 1d6 + your spellcasting ability modifier. Both damage rolls increase by 1d6 at 11th level and 17th level.