Staggering Smite

Source: Player's Handbook (2024)

4th Level Enchantment (Paladin)

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

The target takes an extra 4d6 Psychic damage from the attack, and the target must succeed on a Wisdom saving throw or have the Stunned condition until the end of your next turn. Using a Higher-Level Spell Slot.
The extra damage increases by 1d6 for each spell slot level above 4.