Warding Smite

The target takes an extra 1d8 Force damage from the attack. Until the spell ends, the target has disadvantage on attack rolls against creatures other than you, and whenever the target deals damage to a creature other than you, that creature gains resistance to that damage.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 1. If you used a 3rd level spell slot or higher, for the duration, whenever the target forces a creature other than you to make a saving throw, the creature has advantage on the saving throw.