Divine Smite

Appealing to your god’s anger, you channel their divine wrath into your weapon. The first time you hit a creature with a melee weapon attack during this spell’s duration your attack deals an extra 2d8 radiant damage to the target. The damage increases by 1d8 if the target is an undead or a fiend.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the extra damage dealt by the attack increases by 1d8 for each slot above 1st level.