Divine Smite

Source: Player's Handbook (2024)

1st Level Evocation (Paladin)

Casting Time: Bonus Action(*) Range: Self Components: V Duration: Instantaneous

The target takes an extra 2d8 Radiant damage from the attack. The damage increases by 1d8 if the target is a Fiend or an Undead. Using a Higher-Level Spell Slot.
The damage increases by 1d8 for each spell slot level above 1.