Divine Smite

1st-Level Evocation Spell (Paladin)

Casting Time: Bonus Action, which you take immediately after hitting a target with a Melee weapon or an [[glossary:Unarmed Strike]]
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.

At Higher Levels: The damage increases by 1d8 for each spell slot level above 1.

Source: Player's Handbook, p. 265